diff --git a/src/lib/ComfyGraphCanvas.ts b/src/lib/ComfyGraphCanvas.ts
index f09953e..17e23ba 100644
--- a/src/lib/ComfyGraphCanvas.ts
+++ b/src/lib/ComfyGraphCanvas.ts
@@ -20,6 +20,7 @@ export default class ComfyGraphCanvas extends LGraphCanvas {
 
     constructor(
         app: ComfyApp,
+        graph: LGraph,
         canvas: HTMLCanvasElement | string,
         options: {
             skip_render?: boolean;
@@ -28,7 +29,7 @@ export default class ComfyGraphCanvas extends LGraphCanvas {
             viewport?: Vector4;
         } = {}
     ) {
-        super(canvas, app.lGraph, options);
+        super(canvas, graph, options);
         this.app = app;
         this._unsubscribe = selectionState.subscribe(ss => {
             for (const node of Object.values(this.selected_nodes)) {
diff --git a/src/lib/ComfyNodeDef.ts b/src/lib/ComfyNodeDef.ts
index de281ab..7a9a25d 100644
--- a/src/lib/ComfyNodeDef.ts
+++ b/src/lib/ComfyNodeDef.ts
@@ -27,7 +27,18 @@ export type ComfyNodeDefInput = [ComfyNodeDefInputType, ComfyNodeDefInputOptions
 export type ComfyNodeDefInputType = any[] | keyof typeof ComfyWidgets | string
 
 export type ComfyNodeDefInputOptions = {
-    forceInput?: boolean
+    forceInput?: boolean;
+
+    // NOTE: For COMBO type inputs, the default value is always the first entry the list.
+    default?: any,
+
+    // INT/FLOAT options
+    min?: number,
+    max?: number,
+    step?: number,
+
+    // STRING options
+    multiline?: boolean,
 }
 
 // TODO if/when comfy refactors
diff --git a/src/lib/components/ComfyApp.ts b/src/lib/components/ComfyApp.ts
index ebf3381..7a78573 100644
--- a/src/lib/components/ComfyApp.ts
+++ b/src/lib/components/ComfyApp.ts
@@ -1,4 +1,4 @@
-import { LiteGraph, LGraph, LGraphCanvas, LGraphNode, type LGraphNodeConstructor, type LGraphNodeExecutable, type SerializedLGraph, type SerializedLGraphGroup, type SerializedLGraphNode, type SerializedLLink, NodeMode, type Vector2, BuiltInSlotType, type INodeInputSlot, type NodeID, type NodeTypeSpec, type NodeTypeOpts, type SlotIndex } from "@litegraph-ts/core";
+import { LiteGraph, LGraph, LGraphCanvas, LGraphNode, type LGraphNodeConstructor, type LGraphNodeExecutable, type SerializedLGraph, type SerializedLGraphGroup, type SerializedLGraphNode, type SerializedLLink, NodeMode, type Vector2, BuiltInSlotType, type INodeInputSlot, type NodeID, type NodeTypeSpec, type NodeTypeOpts, type SlotIndex, type UUID } from "@litegraph-ts/core";
 import type { LConnectionKind, INodeSlot } from "@litegraph-ts/core";
 import ComfyAPI, { type ComfyAPIStatusResponse, type ComfyBoxPromptExtraData, type ComfyPromptRequest, type ComfyNodeID, type PromptID } from "$lib/api"
 import { getPngMetadata, importA1111 } from "$lib/pnginfo";
@@ -21,7 +21,7 @@ import type ComfyGraphNode from "$lib/nodes/ComfyGraphNode";
 import queueState from "$lib/stores/queueState";
 import { type SvelteComponentDev } from "svelte/internal";
 import type IComfyInputSlot from "$lib/IComfyInputSlot";
-import type { SerializedLayoutState } from "$lib/stores/layoutState";
+import type { LayoutState, SerializedLayoutState, WritableLayoutStateStore } from "$lib/stores/layoutState";
 import layoutState from "$lib/stores/layoutState";
 import { toast } from '@zerodevx/svelte-toast'
 import ComfyGraph from "$lib/ComfyGraph";
@@ -33,7 +33,7 @@ import { download, graphToGraphVis, jsonToJsObject, promptToGraphVis, range, wor
 import notify from "$lib/notify";
 import configState from "$lib/stores/configState";
 import { blankGraph } from "$lib/defaultGraph";
-import type { ComfyExecutionResult } from "$lib/utils";
+import type { SerializedPromptOutput } from "$lib/utils";
 import ComfyPromptSerializer, { UpstreamNodeLocator, isActiveBackendNode } from "./ComfyPromptSerializer";
 import { iterateNodeDefInputs, type ComfyNodeDef, isBackendNodeDefInputType, iterateNodeDefOutputs } from "$lib/ComfyNodeDef";
 import { ComfyComboNode } from "$lib/nodes/widgets";
@@ -41,6 +41,7 @@ import parseA1111, { type A1111ParsedInfotext } from "$lib/parseA1111";
 import convertA1111ToStdPrompt from "$lib/convertA1111ToStdPrompt";
 import type { ComfyBoxStdPrompt } from "$lib/ComfyBoxStdPrompt";
 import ComfyBoxStdPromptSerializer from "$lib/ComfyBoxStdPromptSerializer";
+import { v4 as uuidv4 } from "uuid";
 
 export const COMFYBOX_SERIAL_VERSION = 1;
 
@@ -51,12 +52,11 @@ if (typeof window !== "undefined") {
 
 /*
  * Queued prompt that hasn't been sent to the backend yet.
- * TODO: Assumes the currently active graph will be serialized, needs to change
- * for multiple loaded workflow support
  */
-type QueueItem = {
+type PromptQueueItem = {
     num: number,
     batchCount: number
+    workflow: ComfyWorkflow
 }
 
 export type A1111PromptAndInfo = {
@@ -111,7 +111,7 @@ export type SerializedPrompt = {
 /*
  * Outputs for each node.
  */
-export type SerializedPromptOutputs = Record<ComfyNodeID, ComfyExecutionResult>
+export type SerializedPromptOutputs = Record<ComfyNodeID, SerializedPromptOutput>
 
 export type Progress = {
     value: number,
@@ -134,20 +134,156 @@ type CanvasState = {
     canvas: ComfyGraphCanvas,
 }
 
-type WorkflowState = {
-    title: string,
-    graph: ComfyGraph,
+type ActiveCanvas = {
+    canvas: LGraphCanvas | null;
+    canvasHandler: () => void | null;
+    state: SerializedGraphCanvasState;
+}
+
+export type SerializedWorkflowState = {
+    graph: SerializedLGraph,
+    layout: SerializedLayoutState
+}
+
+/*
+ * ID for an opened workflow.
+ *
+ * Unlike NodeID and PromptID, these are *not* saved to the workflow itself.
+ * They are only used for identifying an open workflow in the program. If the
+ * workflow is closed and reopened, a different workflow ID will be assigned to
+ * it.
+ */
+export type WorkflowInstID = UUID;
+
+export class ComfyWorkflow {
+    /*
+     * Used for uniquely identifying the instance of the opened workflow in the frontend.
+     */
+    id: WorkflowInstID;
+    title: string;
+    graph: ComfyGraph;
+    layout: WritableLayoutStateStore;
+
+    canvases: Record<string, ActiveCanvas> = {};
+
+    constructor(title: string, graph: ComfyGraph, layout: WritableLayoutStateStore) {
+        this.id = uuidv4();
+        this.title = title;
+        this.layout = layout;
+        this.graph = graph;
+    }
+
+    start(key: string, canvas: ComfyGraphCanvas) {
+        if (this.canvases[key] != null)
+            throw new Error(`This workflow is already being displayed on canvas ${key}`)
+
+        const canvasHandler = () => canvas.draw(true);
+
+        this.canvases[key] = {
+            canvas,
+            canvasHandler,
+            state: {
+                // TODO
+                offset: [0, 0],
+                scale: 1
+            }
+        }
+
+        this.graph.attachCanvas(canvas);
+        this.graph.eventBus.on("afterExecute", canvasHandler)
+
+        if (Object.keys(this.canvases).length === 1)
+            this.graph.start();
+    }
+
+    stop(key: string) {
+        const canvas = this.canvases[key]
+        if (canvas == null)
+            throw new Error(`This workflow is not being displayed on canvas ${key}`)
+
+        this.graph.detachCanvas(canvas.canvas);
+        this.graph.eventBus.removeListener("afterExecute", canvas.canvasHandler)
+
+        delete this.canvases[key]
+
+        if (Object.keys(this.canvases).length === 0)
+            this.graph.stop();
+    }
+
+    stopAll() {
+        for (const key of Object.keys(this.canvases))
+            this.stop(key)
+        this.graph.stop()
+    }
+
+    serialize(): SerializedWorkflowState {
+        const graph = this.graph;
+
+        const serializedGraph = graph.serialize()
+        const serializedLayout = this.layout.serialize()
+
+        return {
+            graph: serializedGraph,
+            layout: serializedLayout
+        }
+    }
+
+    static deserialize(data: SerializedWorkflowState): ComfyWorkflow {
+        const layout = layoutState; // TODO
+        // Ensure loadGraphData does not trigger any state changes in layoutState
+        // (isConfiguring is set to true here)
+        // lGraph.configure will add new nodes, triggering onNodeAdded, but we
+        // want to restore the layoutState ourselves
+        layout.onStartConfigure();
+
+        // Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
+        for (let n of data.graph.nodes) {
+            if (n.type == "T2IAdapterLoader") n.type = "ControlNetLoader";
+        }
+
+        const graph = new ComfyGraph();
+        graph.configure(data.graph);
+
+        for (const node of graph._nodes) {
+            const size = node.computeSize();
+            size[0] = Math.max(node.size[0], size[0]);
+            size[1] = Math.max(node.size[1], size[1]);
+            node.size = size;
+            // this.#invokeExtensions("loadedGraphNode", node);
+        }
+
+        // Now restore the layout
+        // Subsequent added nodes will add the UI data to layoutState
+        // TODO
+        layout.deserialize(data.layout, graph)
+
+        return new ComfyWorkflow("Workflow X", graph, layout);
+    }
 }
 
 export default class ComfyApp {
     api: ComfyAPI;
+
     rootEl: HTMLDivElement | null = null;
     canvasEl: HTMLCanvasElement | null = null;
     canvasCtx: CanvasRenderingContext2D | null = null;
-    lGraph: ComfyGraph | null = null;
     lCanvas: ComfyGraphCanvas | null = null;
-    dropZone: HTMLElement | null = null;
-    nodeOutputs: Record<string, any> = {};
+
+    openedWorkflows: ComfyWorkflow[] = [];
+    openedWorkflowsByID: Record<WorkflowInstID, ComfyWorkflow> = {};
+    activeWorkflowIdx: number = -1;
+
+    get activeWorkflow(): ComfyWorkflow | null {
+        return this.openedWorkflows[this.activeWorkflowIdx]
+    }
+
+    get activeGraph(): ComfyGraph | null {
+        return this.activeWorkflow?.graph;
+    }
+
+    getWorkflow(id: WorkflowInstID): ComfyWorkflow | null {
+        return this.openedWorkflowsByID[id];
+    }
 
     shiftDown: boolean = false;
     ctrlDown: boolean = false;
@@ -155,7 +291,7 @@ export default class ComfyApp {
     alreadySetup: Writable<boolean> = writable(false);
     a1111Prompt: Writable<A1111PromptAndInfo | null> = writable(null);
 
-    private queueItems: QueueItem[] = [];
+    private queueItems: PromptQueueItem[] = [];
     private processingQueue: boolean = false;
     private promptSerializer: ComfyPromptSerializer;
     private stdPromptSerializer: ComfyBoxStdPromptSerializer;
@@ -176,8 +312,7 @@ export default class ComfyApp {
 
         this.rootEl = document.getElementById("app-root") as HTMLDivElement;
         this.canvasEl = document.getElementById("graph-canvas") as HTMLCanvasElement;
-        this.lGraph = new ComfyGraph();
-        this.lCanvas = new ComfyGraphCanvas(this, this.canvasEl);
+        this.lCanvas = new ComfyGraphCanvas(this, null, this.canvasEl);
         this.canvasCtx = this.canvasEl.getContext("2d");
 
         const uiUnlocked = get(uiState).uiUnlocked;
@@ -193,7 +328,7 @@ export default class ComfyApp {
             const json = localStorage.getItem("workflow");
             if (json) {
                 const state = JSON.parse(json) as SerializedAppState;
-                await this.deserialize(state)
+                await this.openWorkflow(state)
                 restored = true;
             }
         } catch (err) {
@@ -236,6 +371,24 @@ export default class ComfyApp {
         this.lCanvas.draw(true, true);
     }
 
+    serialize(): SerializedAppState {
+        const workflow = this.activeWorkflow
+        if (workflow == null)
+            throw new Error("No workflow active!")
+
+        const { graph, layout } = workflow.serialize();
+        const canvas = this.lCanvas.serialize();
+
+        return {
+            createdBy: "ComfyBox",
+            version: COMFYBOX_SERIAL_VERSION,
+            commitHash: __GIT_COMMIT_HASH__,
+            workflow: graph,
+            layout,
+            canvas
+        }
+    }
+
     saveStateToLocalStorage() {
         try {
             uiState.update(s => { s.isSavingToLocalStorage = true; return s; })
@@ -362,8 +515,12 @@ export default class ComfyApp {
                 } catch (error) { }
             }
 
-            if (workflow && workflow.version && workflow.nodes && workflow.extra) {
-                this.loadGraphData(workflow);
+            if (workflow && workflow.createdBy === "ComfyBox") {
+                this.openWorkflow(workflow);
+            }
+            else {
+                // TODO handle vanilla workflows
+                throw new Error("Workflow was not in ComfyBox format!")
             }
         });
     }
@@ -386,21 +543,27 @@ export default class ComfyApp {
 
         this.api.addEventListener("progress", (progress: Progress) => {
             queueState.progressUpdated(progress);
-            this.lGraph.setDirtyCanvas(true, false);
+            this.activeGraph?.setDirtyCanvas(true, false); // TODO PromptID
         });
 
         this.api.addEventListener("executing", (promptID: PromptID | null, nodeID: ComfyNodeID | null) => {
-            queueState.executingUpdated(promptID, nodeID);
-            this.lGraph.setDirtyCanvas(true, false);
+            const queueEntry = queueState.executingUpdated(promptID, nodeID);
+            if (queueEntry != null) {
+                const workflow = this.getWorkflow(queueEntry.workflowID)
+                workflow?.graph.setDirtyCanvas(true, false);
+            }
         });
 
-        this.api.addEventListener("executed", (promptID: PromptID, nodeID: ComfyNodeID, output: ComfyExecutionResult) => {
-            this.nodeOutputs[nodeID] = output;
-            const node = this.lGraph.getNodeByIdRecursive(nodeID) as ComfyGraphNode;
-            if (node?.onExecuted) {
-                node.onExecuted(output);
+        this.api.addEventListener("executed", (promptID: PromptID, nodeID: ComfyNodeID, output: SerializedPromptOutput) => {
+            const queueEntry = queueState.onExecuted(promptID, nodeID, output)
+            if (queueEntry != null) {
+                const workflow = this.getWorkflow(queueEntry.workflowID)
+                workflow?.graph.setDirtyCanvas(true, false);
+                const node = workflow?.graph.getNodeByIdRecursive(nodeID) as ComfyGraphNode;
+                if (node?.onExecuted) {
+                    node.onExecuted(output);
+                }
             }
-            queueState.onExecuted(promptID, nodeID, output)
         });
 
         this.api.addEventListener("execution_start", (promptID: PromptID) => {
@@ -467,46 +630,68 @@ export default class ComfyApp {
         setColor(BuiltInSlotType.ACTION, "lightseagreen")
     }
 
-    serialize(): SerializedAppState {
-        const graph = this.lGraph;
-
-        const serializedGraph = graph.serialize()
-        const serializedLayout = layoutState.serialize()
-        const serializedCanvas = this.lCanvas.serialize();
-
-        return {
-            createdBy: "ComfyBox",
-            version: COMFYBOX_SERIAL_VERSION,
-            workflow: serializedGraph,
-            layout: serializedLayout,
-            canvas: serializedCanvas
-        }
+    createNewWorkflow(): ComfyWorkflow {
+        // TODO remove
+        const workflow = ComfyWorkflow.deserialize({ graph: blankGraph.workflow, layout: blankGraph.layout })
+        this.openedWorkflows.push(workflow);
+        this.setActiveWorkflow(this.openedWorkflows.length - 1)
+        return workflow;
     }
 
-    async deserialize(data: SerializedAppState) {
+    async openWorkflow(data: SerializedAppState): Promise<ComfyWorkflow> {
         if (data.version !== COMFYBOX_SERIAL_VERSION) {
             throw `Invalid ComfyBox saved data format: ${data.version}`
         }
 
-        // Ensure loadGraphData does not trigger any state changes in layoutState
-        // (isConfiguring is set to true here)
-        // lGraph.configure will add new nodes, triggering onNodeAdded, but we
-        // want to restore the layoutState ourselves
-        layoutState.onStartConfigure();
+        this.clean();
 
-        this.loadGraphData(data.workflow)
-
-        // Now restore the layout
-        // Subsequent added nodes will add the UI data to layoutState
-        layoutState.deserialize(data.layout, this.lGraph)
+        const workflow = ComfyWorkflow.deserialize({ graph: data.workflow, layout: data.layout })
 
         // Restore canvas offset/zoom
         this.lCanvas.deserialize(data.canvas)
 
-        await this.refreshComboInNodes();
+        await this.refreshComboInNodes(workflow);
 
-        this.lGraph.start();
-        this.lGraph.eventBus.on("afterExecute", () => this.lCanvas.draw(true))
+        this.openedWorkflows.push(workflow);
+        this.setActiveWorkflow(this.openedWorkflows.length - 1)
+
+        return workflow;
+    }
+
+    closeWorkflow(index: number) {
+        if (index < 0 || index >= this.openedWorkflows.length)
+            return;
+
+        const workflow = this.openedWorkflows[index];
+        workflow.stopAll();
+
+        this.openedWorkflows.splice(index, 1)
+        this.setActiveWorkflow(0);
+    }
+
+    closeAllWorkflows() {
+        while (this.openedWorkflows.length > 0)
+            this.closeWorkflow(0)
+    }
+
+    setActiveWorkflow(index: number) {
+        if (this.openedWorkflows.length === 0) {
+            this.activeWorkflowIdx = -1;
+            return;
+        }
+
+        if (index < 0 || index >= this.openedWorkflows.length || this.activeWorkflowIdx === index)
+            return;
+
+        if (this.activeWorkflow != null)
+            this.activeWorkflow.stop("app")
+
+        const workflow = this.openedWorkflows[index]
+        this.activeWorkflowIdx = index;
+
+        console.warn("START")
+        workflow.start("app", this.lCanvas);
+        this.lCanvas.deserialize(workflow.canvases["app"].state)
     }
 
     async initDefaultGraph() {
@@ -520,50 +705,14 @@ export default class ComfyApp {
             notify(`Failed to load default graph: ${error}`, { type: "error" })
             state = structuredClone(blankGraph)
         }
-        await this.deserialize(state)
-    }
-
-    /**
-     * Populates the graph with the specified workflow data
-     * @param {*} graphData A serialized graph object
-     */
-    loadGraphData(graphData: SerializedLGraph) {
-        this.clean();
-
-        // Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
-        for (let n of graphData.nodes) {
-            if (n.type == "T2IAdapterLoader") n.type = "ControlNetLoader";
-        }
-
-        this.lGraph.configure(graphData);
-
-        for (const node of this.lGraph._nodes) {
-            const size = node.computeSize();
-            size[0] = Math.max(node.size[0], size[0]);
-            size[1] = Math.max(node.size[1], size[1]);
-            node.size = size;
-            // this.#invokeExtensions("loadedGraphNode", node);
-        }
+        await this.openWorkflow(state)
     }
 
     clear() {
         this.clean();
 
-        const blankGraph: SerializedLGraph = {
-            last_node_id: 0,
-            last_link_id: 0,
-            nodes: [],
-            links: [],
-            groups: [],
-            config: {},
-            extra: {},
-            version: 0
-        }
-
-        layoutState.onStartConfigure();
         this.lCanvas.closeAllSubgraphs();
-        this.lGraph.configure(blankGraph)
-        layoutState.initDefaultLayout();
+        this.closeAllWorkflows();
         uiState.update(s => {
             s.uiUnlocked = true;
             s.uiEditMode = "widgets";
@@ -572,7 +721,10 @@ export default class ComfyApp {
     }
 
     runDefaultQueueAction() {
-        for (const node of this.lGraph.iterateNodesInOrderRecursive()) {
+        if (this.activeWorkflow == null)
+            return;
+
+        for (const node of this.activeGraph.iterateNodesInOrderRecursive()) {
             if ("onDefaultQueueAction" in node) {
                 (node as ComfyGraphNode).onDefaultQueueAction()
             }
@@ -614,12 +766,17 @@ export default class ComfyApp {
      * Converts the current graph workflow for sending to the API
      * @returns The workflow and node links
      */
-    graphToPrompt(tag: string | null = null): SerializedPrompt {
-        return this.promptSerializer.serialize(this.lGraph, tag)
+    graphToPrompt(workflow: ComfyWorkflow, tag: string | null = null): SerializedPrompt {
+        return this.promptSerializer.serialize(workflow.graph, tag)
     }
 
     async queuePrompt(num: number, batchCount: number = 1, tag: string | null = null) {
-        this.queueItems.push({ num, batchCount });
+        if (this.activeWorkflow === null) {
+            notify("No workflow is opened!", { type: "error" })
+            return;
+        }
+
+        this.queueItems.push({ num, batchCount, workflow: this.activeWorkflow });
 
         // Only have one action process the items so each one gets a unique seed correctly
         if (this.processingQueue) {
@@ -630,13 +787,15 @@ export default class ComfyApp {
             tag = null;
 
         this.processingQueue = true;
+        let workflow;
+
         try {
             while (this.queueItems.length) {
-                ({ num, batchCount } = this.queueItems.pop());
+                ({ num, batchCount, workflow } = this.queueItems.pop());
                 console.debug(`Queue get! ${num} ${batchCount} ${tag}`);
 
                 const thumbnails = []
-                for (const node of this.lGraph.iterateNodesInOrderRecursive()) {
+                for (const node of workflow.graph.iterateNodesInOrderRecursive()) {
                     if (node.mode !== NodeMode.ALWAYS
                         || (tag != null
                             && Array.isArray(node.properties.tags)
@@ -651,7 +810,7 @@ export default class ComfyApp {
                 }
 
                 for (let i = 0; i < batchCount; i++) {
-                    for (const node of this.lGraph.iterateNodesInOrderRecursive()) {
+                    for (const node of workflow.graph.iterateNodesInOrderRecursive()) {
                         if (node.mode !== NodeMode.ALWAYS)
                             continue;
 
@@ -660,9 +819,9 @@ export default class ComfyApp {
                         }
                     }
 
-                    const p = this.graphToPrompt(tag);
+                    const p = this.graphToPrompt(workflow, tag);
                     const l = layoutState.serialize();
-                    console.debug(graphToGraphVis(this.lGraph))
+                    console.debug(graphToGraphVis(workflow.graph))
                     console.debug(promptToGraphVis(p))
 
                     const stdPrompt = this.stdPromptSerializer.serialize(p);
@@ -692,7 +851,7 @@ export default class ComfyApp {
                             error = response.error;
                         }
                         else {
-                            queueState.afterQueued(response.promptID, num, p.output, extraData)
+                            queueState.afterQueued(workflow.id, response.promptID, num, p.output, extraData)
                         }
                     } catch (err) {
                         error = err?.toString();
@@ -701,13 +860,13 @@ export default class ComfyApp {
                     if (error != null) {
                         const mes: string = error;
                         notify(`Error queuing prompt:\n${mes}`, { type: "error" })
-                        console.error(graphToGraphVis(this.lGraph))
+                        console.error(graphToGraphVis(workflow.graph))
                         console.error(promptToGraphVis(p))
                         console.error("Error queuing prompt", error, num, p)
                         break;
                     }
 
-                    for (const node of this.lGraph.iterateNodesInOrderRecursive()) {
+                    for (const node of workflow.graph.iterateNodesInOrderRecursive()) {
                         if ("afterQueued" in node) {
                             (node as ComfyGraphNode).afterQueued(p, tag);
                         }
@@ -730,7 +889,7 @@ export default class ComfyApp {
             const pngInfo = await getPngMetadata(file);
             if (pngInfo) {
                 if (pngInfo.comfyBoxConfig) {
-                    this.deserialize(JSON.parse(pngInfo.comfyBoxConfig));
+                    await this.openWorkflow(JSON.parse(pngInfo.comfyBoxConfig));
                 } else if (pngInfo.parameters) {
                     const parsed = parseA1111(pngInfo.parameters)
                     if ("error" in parsed) {
@@ -752,8 +911,8 @@ export default class ComfyApp {
             }
         } else if (file.type === "application/json" || file.name.endsWith(".json")) {
             const reader = new FileReader();
-            reader.onload = () => {
-                this.deserialize(JSON.parse(reader.result as string));
+            reader.onload = async () => {
+                await this.openWorkflow(JSON.parse(reader.result as string));
             };
             reader.readAsText(file);
         }
@@ -772,7 +931,7 @@ export default class ComfyApp {
     /**
      * Refresh combo list on whole nodes
      */
-    async refreshComboInNodes(flashUI: boolean = false) {
+    async refreshComboInNodes(workflow: ComfyWorkflow, flashUI: boolean = false) {
         const defs = await this.api.getNodeDefs();
 
         const isComfyComboNode = (node: LGraphNode): node is ComfyComboNode => {
@@ -816,7 +975,7 @@ export default class ComfyApp {
             return result
         }
 
-        for (const node of this.lGraph.iterateNodesInOrderRecursive()) {
+        for (const node of workflow.graph.iterateNodesInOrderRecursive()) {
             if (!isActiveBackendNode(node))
                 continue;
 
@@ -838,7 +997,7 @@ export default class ComfyApp {
         console.debug("[refreshComboInNodes] found:", backendUpdatedCombos.length, backendUpdatedCombos)
 
         // Mark combo nodes without backend configs as being loaded already.
-        for (const node of this.lGraph.iterateNodesOfClassRecursive(ComfyComboNode)) {
+        for (const node of workflow.graph.iterateNodesOfClassRecursive(ComfyComboNode)) {
             if (backendUpdatedCombos[node.id] != null) {
                 continue;
             }
@@ -870,12 +1029,15 @@ export default class ComfyApp {
         // Load definitions from the backend.
         for (const { comboNode, comfyInput, backendNode } of Object.values(backendUpdatedCombos)) {
             const def = defs[backendNode.type];
-            const rawValues = def["input"]["required"][comfyInput.name][0];
+            const [rawValues, opts] = def.input.required[comfyInput.name];
 
             console.debug("[ComfyApp] Reconfiguring combo widget", backendNode.type, "=>", comboNode.type, rawValues.length)
             comboNode.doAutoConfig(comfyInput, { includeProperties: new Set(["values"]), setWidgetTitle: false })
 
-            comboNode.formatValues(rawValues as string[], true)
+            const values = rawValues as string[]
+            const defaultValue = rawValues[0];
+
+            comboNode.formatValues(values, defaultValue, true)
             if (!rawValues?.includes(get(comboNode.value))) {
                 comboNode.setValue(rawValues[0], comfyInput.config.defaultValue)
             }
@@ -886,7 +1048,6 @@ export default class ComfyApp {
      * Clean current state
      */
     clean() {
-        this.nodeOutputs = {};
         this.a1111Prompt.set(null);
     }
 }
diff --git a/src/lib/components/ComfyWorkflowsView.svelte b/src/lib/components/ComfyWorkflowsView.svelte
index ed6dcbc..8604dcc 100644
--- a/src/lib/components/ComfyWorkflowsView.svelte
+++ b/src/lib/components/ComfyWorkflowsView.svelte
@@ -275,6 +275,12 @@
                 Error loading app
             </div>
             <div>{error}</div>
+            {#if error.stack}
+                {@const lines = error.stack.split("\n")}
+                {#each lines as line}
+                    <div style:font-size="16px">{line}</div>
+                {/each}
+            {/if}
         </div>
     {/await}
 {/if}
diff --git a/src/lib/defaultGraph.ts b/src/lib/defaultGraph.ts
index a296a76..9becb14 100644
--- a/src/lib/defaultGraph.ts
+++ b/src/lib/defaultGraph.ts
@@ -1,4 +1,4 @@
-import type SerializedAppState from "./ComfyApp"
+import type { SerializedAppState } from "./components/ComfyApp"
 
 const blankGraph: SerializedAppState = {
     createdBy: "ComfyBox",
@@ -13,7 +13,14 @@ const blankGraph: SerializedAppState = {
         extra: {},
         version: 0
     },
-    panes: {}
+    layout: {
+        root: null,
+        allItems: {},
+        attrs: {
+            queuePromptButtonName: "Queue Prompt",
+            queuePromptButtonRunWorkflow: true
+        }
+    }
 }
 
 export { blankGraph }
diff --git a/src/lib/nodes/ComfyActionNodes.ts b/src/lib/nodes/ComfyActionNodes.ts
index 9e083a3..ba08046 100644
--- a/src/lib/nodes/ComfyActionNodes.ts
+++ b/src/lib/nodes/ComfyActionNodes.ts
@@ -8,7 +8,7 @@ import ComfyGraphNode, { type ComfyGraphNodeProperties } from "./ComfyGraphNode"
 import type { ComfyWidgetNode } from "$lib/nodes/widgets";
 import type { NotifyOptions } from "$lib/notify";
 import type { FileData as GradioFileData } from "@gradio/upload";
-import { type ComfyExecutionResult, type ComfyImageLocation, convertComfyOutputToGradio, type ComfyUploadImageAPIResponse, parseWhateverIntoComfyImageLocations } from "$lib/utils";
+import { type SerializedPromptOutput, type ComfyImageLocation, convertComfyOutputToGradio, type ComfyUploadImageAPIResponse, parseWhateverIntoComfyImageLocations } from "$lib/utils";
 
 export class ComfyQueueEvents extends ComfyGraphNode {
     static slotLayout: SlotLayout = {
@@ -63,7 +63,7 @@ LiteGraph.registerNodeType({
 })
 
 export interface ComfyStoreImagesActionProperties extends ComfyGraphNodeProperties {
-    images: ComfyExecutionResult | null
+    images: SerializedPromptOutput | null
 }
 
 export class ComfyStoreImagesAction extends ComfyGraphNode {
@@ -90,7 +90,7 @@ export class ComfyStoreImagesAction extends ComfyGraphNode {
         if (action !== "store" || !param || !("images" in param))
             return;
 
-        this.setProperty("images", param as ComfyExecutionResult)
+        this.setProperty("images", param as SerializedPromptOutput)
         this.setOutputData(0, this.properties.images)
     }
 }
@@ -223,7 +223,7 @@ export class ComfyNotifyAction extends ComfyGraphNode {
         // native notifications.
         if (param != null && typeof param === "object") {
             if ("images" in param) {
-                const output = param as ComfyExecutionResult;
+                const output = param as SerializedPromptOutput;
                 const converted = convertComfyOutputToGradio(output);
                 if (converted.length > 0)
                     options.imageUrl = converted[0].data;
diff --git a/src/lib/nodes/ComfyBackendNode.ts b/src/lib/nodes/ComfyBackendNode.ts
index c899b19..4c8ac2f 100644
--- a/src/lib/nodes/ComfyBackendNode.ts
+++ b/src/lib/nodes/ComfyBackendNode.ts
@@ -6,7 +6,7 @@ import { BuiltInSlotShape, BuiltInSlotType, type SerializedLGraphNode } from "@l
 import type IComfyInputSlot from "$lib/IComfyInputSlot";
 import type { ComfyInputConfig } from "$lib/IComfyInputSlot";
 import { iterateNodeDefOutputs, type ComfyNodeDef, iterateNodeDefInputs } from "$lib/ComfyNodeDef";
-import type { ComfyExecutionResult } from "$lib/utils";
+import type { SerializedPromptOutput } from "$lib/utils";
 
 /*
  * Base class for any node with configuration sent by the backend.
@@ -111,7 +111,7 @@ export class ComfyBackendNode extends ComfyGraphNode {
         }
     }
 
-    override onExecuted(outputData: ComfyExecutionResult) {
+    override onExecuted(outputData: SerializedPromptOutput) {
         console.warn("onExecuted outputs", outputData)
         this.triggerSlot(0, outputData)
     }
diff --git a/src/lib/nodes/ComfyGraphNode.ts b/src/lib/nodes/ComfyGraphNode.ts
index 1fb1883..6670a73 100644
--- a/src/lib/nodes/ComfyGraphNode.ts
+++ b/src/lib/nodes/ComfyGraphNode.ts
@@ -3,7 +3,7 @@ import type { SerializedPrompt } from "$lib/components/ComfyApp";
 import { LGraph, LGraphNode, LLink, LiteGraph, NodeMode, type INodeInputSlot, type SerializedLGraphNode, type Vector2, type INodeOutputSlot, LConnectionKind, type SlotType, LGraphCanvas, getStaticPropertyOnInstance, type PropertyLayout, type SlotLayout } from "@litegraph-ts/core";
 import type { SvelteComponentDev } from "svelte/internal";
 import type { ComfyWidgetNode } from "$lib/nodes/widgets";
-import type { ComfyExecutionResult, ComfyImageLocation } from "$lib/utils"
+import type { SerializedPromptOutput, ComfyImageLocation } from "$lib/utils"
 import type IComfyInputSlot from "$lib/IComfyInputSlot";
 import uiState from "$lib/stores/uiState";
 import { get } from "svelte/store";
@@ -48,7 +48,7 @@ export default class ComfyGraphNode extends LGraphNode {
      * Triggered when the backend sends a finished output back with this node's ID.
      * Valid for output nodes like SaveImage and PreviewImage.
      */
-    onExecuted?(output: ComfyExecutionResult): void;
+    onExecuted?(output: SerializedPromptOutput): void;
 
     /*
      * When a prompt is queued, this will be called on the node if it can
diff --git a/src/lib/stores/queueState.ts b/src/lib/stores/queueState.ts
index ebe8a3d..6c085f2 100644
--- a/src/lib/stores/queueState.ts
+++ b/src/lib/stores/queueState.ts
@@ -1,5 +1,5 @@
 import type { ComfyAPIHistoryEntry, ComfyAPIHistoryItem, ComfyAPIHistoryResponse, ComfyAPIQueueResponse, ComfyAPIStatusResponse, ComfyBoxPromptExtraData, ComfyNodeID, PromptID } from "$lib/api";
-import type { Progress, SerializedPromptInputsAll, SerializedPromptOutputs } from "$lib/components/ComfyApp";
+import type { Progress, SerializedPromptInputsAll, SerializedPromptOutputs, WorkflowInstID } from "$lib/components/ComfyApp";
 import type { ComfyExecutionResult } from "$lib/nodes/ComfyWidgetNodes";
 import notify from "$lib/notify";
 import { get, writable, type Writable } from "svelte/store";
@@ -11,12 +11,13 @@ type QueueStateOps = {
     historyUpdated: (resp: ComfyAPIHistoryResponse) => void,
     statusUpdated: (status: ComfyAPIStatusResponse | null) => void,
     executionStart: (promptID: PromptID) => void,
-    executingUpdated: (promptID: PromptID | null, runningNodeID: ComfyNodeID | null) => void,
+    executingUpdated: (promptID: PromptID | null, runningNodeID: ComfyNodeID | null) => QueueEntry | null;
     executionCached: (promptID: PromptID, nodes: ComfyNodeID[]) => void,
     executionError: (promptID: PromptID, message: string) => void,
     progressUpdated: (progress: Progress) => void
-    afterQueued: (promptID: PromptID, number: number, prompt: SerializedPromptInputsAll, extraData: any) => void
-    onExecuted: (promptID: PromptID, nodeID: ComfyNodeID, output: ComfyExecutionResult) => void
+    getQueueEntry: (promptID: PromptID) => QueueEntry | null;
+    afterQueued: (workflowID: WorkflowInstID, promptID: PromptID, number: number, prompt: SerializedPromptInputsAll, extraData: any) => void
+    onExecuted: (promptID: PromptID, nodeID: ComfyNodeID, output: ComfyExecutionResult) => QueueEntry | null
 }
 
 /*
@@ -36,6 +37,8 @@ export type QueueEntry = {
 
     /*** Data not sent by ComfyUI's API, lost on page refresh ***/
 
+    /* Workflow tab that sent the prompt.  */
+    workflowID?: WorkflowInstID,
     /* Prompt outputs, collected while the prompt is still executing */
     outputs: SerializedPromptOutputs,
     /* Nodes of the workflow that have finished running so far. */
@@ -150,6 +153,21 @@ function statusUpdated(status: ComfyAPIStatusResponse | null) {
     })
 }
 
+function getQueueEntry(promptID: PromptID): QueueEntry | null {
+    const state = get(store);
+
+    let found = get(state.queuePending).find(e => e.promptID === promptID)
+    if (found != null) return found;
+
+    found = get(state.queueRunning).find(e => e.promptID === promptID)
+    if (found != null) return found;
+
+    let foundCompleted = get(state.queueCompleted).find(e => e.entry.promptID === promptID)
+    if (foundCompleted != null) return foundCompleted.entry;
+
+    return null;
+}
+
 function findEntryInPending(promptID: PromptID): [number, QueueEntry | null, Writable<QueueEntry[]> | null] {
     const state = get(store);
     let index = get(state.queuePending).findIndex(e => e.promptID === promptID)
@@ -180,8 +198,10 @@ function moveToCompleted(index: number, queue: Writable<QueueEntry[]>, status: Q
     store.set(state)
 }
 
-function executingUpdated(promptID: PromptID, runningNodeID: ComfyNodeID | null) {
+function executingUpdated(promptID: PromptID, runningNodeID: ComfyNodeID | null): QueueEntry | null {
     console.debug("[queueState] executingUpdated", promptID, runningNodeID)
+    let entry_ = null;
+
     store.update((s) => {
         s.progress = null;
 
@@ -214,8 +234,11 @@ function executingUpdated(promptID: PromptID, runningNodeID: ComfyNodeID | null)
             s.progress = null;
             s.runningNodeID = null;
         }
+        entry_ = entry;
         return s
     })
+
+    return entry_;
 }
 
 function executionCached(promptID: PromptID, nodes: ComfyNodeID[]) {
@@ -283,16 +306,18 @@ function executionStart(promptID: PromptID) {
     })
 }
 
-function afterQueued(promptID: PromptID, number: number, prompt: SerializedPromptInputsAll, extraData: any) {
+function afterQueued(workflowID: WorkflowInstID, promptID: PromptID, number: number, prompt: SerializedPromptInputsAll, extraData: any) {
     console.debug("[queueState] afterQueued", promptID, Object.keys(prompt))
     store.update(s => {
         const [index, entry, queue] = findEntryInPending(promptID);
         if (entry == null) {
             const entry = createNewQueueEntry(promptID, number, prompt, extraData);
+            entry.workflowID = workflowID;
             s.queuePending.update(qp => { qp.push(entry); return qp })
             console.debug("[queueState] ADD PROMPT", promptID)
         }
         else {
+            entry.workflowID = workflowID;
             entry.number = number;
             entry.prompt = prompt
             entry.extraData = extraData
@@ -304,19 +329,22 @@ function afterQueued(promptID: PromptID, number: number, prompt: SerializedPromp
     })
 }
 
-function onExecuted(promptID: PromptID, nodeID: ComfyNodeID, output: ComfyExecutionResult) {
-    console.debug("[queueState] onExecuted", promptID, nodeID, output)
+function onExecuted(promptID: PromptID, nodeID: ComfyNodeID, outputs: ComfyExecutionResult): QueueEntry | null {
+    console.debug("[queueState] onExecuted", promptID, nodeID, outputs)
+    let entry_ = null;
     store.update(s => {
         const [index, entry, queue] = findEntryInPending(promptID)
         if (entry != null) {
-            entry.outputs[nodeID] = output;
+            entry.outputs[nodeID] = outputs;
             queue.set(get(queue))
         }
         else {
             console.error("[queueState] Could not find in pending! (onExecuted)", promptID)
         }
+        entry_ = entry;
         return s
     })
+    return entry;
 }
 
 const queueStateStore: WritableQueueStateStore =
@@ -331,6 +359,7 @@ const queueStateStore: WritableQueueStateStore =
     executionCached,
     executionError,
     afterQueued,
+    getQueueEntry,
     onExecuted
 }
 export default queueStateStore;
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 4509436..79fc7f0 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -203,12 +203,12 @@ export function promptToGraphVis(prompt: SerializedPrompt): string {
 
 export function getNodeInfo(nodeId: ComfyNodeID): string {
     let app = (window as any).app;
-    if (!app || !app.lGraph)
+    if (!app?.activeGraph)
         return String(nodeId);
 
     const displayNodeID = nodeId ? (nodeId.split("-")[0]) : String(nodeId);
 
-    const title = app.lGraph.getNodeByIdRecursive(nodeId)?.title || String(nodeId);
+    const title = app.activeGraph.getNodeByIdRecursive(nodeId)?.title || String(nodeId);
     return title + " (" + displayNodeID + ")"
 }
 
@@ -222,7 +222,7 @@ export const debounce = (callback: Function, wait = 250) => {
     };
 };
 
-export function convertComfyOutputToGradio(output: ComfyExecutionResult): GradioFileData[] {
+export function convertComfyOutputToGradio(output: SerializedPromptOutput): GradioFileData[] {
     return output.images.map(convertComfyOutputEntryToGradio);
 }
 
@@ -329,11 +329,16 @@ export async function uploadImageToComfyUI(blob: Blob, filename: string, type: C
 }
 
 /** Raw output as received from ComfyUI's backend */
-export interface ComfyExecutionResult {
+export interface SerializedPromptOutput {
     // Technically this response can contain arbitrary data, but "images" is the
     // most frequently used as it's output by LoadImage and PreviewImage, the
     // only two output nodes in base ComfyUI.
     images: ComfyImageLocation[] | null,
+
+    /*
+     * Other data
+     */
+    [key: string]: any
 }
 
 /** Raw output entry as received from ComfyUI's backend */
@@ -375,7 +380,7 @@ export function isComfyBoxImageMetadataArray(value: any): value is ComfyBoxImage
     return Array.isArray(value) && value.every(isComfyBoxImageMetadata);
 }
 
-export function isComfyExecutionResult(value: any): value is ComfyExecutionResult {
+export function isComfyExecutionResult(value: any): value is SerializedPromptOutput {
     return value && typeof value === "object" && Array.isArray(value.images)
 }
 
@@ -415,7 +420,7 @@ export function comfyFileToAnnotatedFilepath(comfyUIFile: ComfyImageLocation): s
     return path;
 }
 
-export function executionResultToImageMetadata(result: ComfyExecutionResult): ComfyBoxImageMetadata[] {
+export function executionResultToImageMetadata(result: SerializedPromptOutput): ComfyBoxImageMetadata[] {
     return result.images.map(comfyFileToComfyBoxMetadata)
 }
 
diff --git a/src/lib/widgets.ts b/src/lib/widgets.ts
index 8a67428..3635d20 100644
--- a/src/lib/widgets.ts
+++ b/src/lib/widgets.ts
@@ -2,11 +2,12 @@ import { LGraphNode, LiteGraph } from "@litegraph-ts/core";
 import type IComfyInputSlot from "./IComfyInputSlot";
 import type { ComfyInputConfig } from "./IComfyInputSlot";
 import { ComfyComboNode, ComfyNumberNode, ComfyTextNode } from "./nodes/widgets";
+import type { ComfyNodeDefInput } from "./ComfyNodeDef";
 
-type WidgetFactory = (node: LGraphNode, inputName: string, inputData: any) => IComfyInputSlot;
+type WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput) => IComfyInputSlot;
 
-function getNumberDefaults(inputData: any, defaultStep: number): ComfyInputConfig {
-    let defaultValue = inputData[1]["default"];
+function getNumberDefaults(inputData: ComfyNodeDefInput, defaultStep: number): ComfyInputConfig {
+    let defaultValue = inputData[1].default;
     let { min, max, step } = inputData[1];
 
     if (defaultValue == undefined) defaultValue = 0;
@@ -33,25 +34,25 @@ function addComfyInput(node: LGraphNode, inputName: string, extraInfo: Partial<I
     return input;
 }
 
-const FLOAT: WidgetFactory = (node: LGraphNode, inputName: string, inputData: any): IComfyInputSlot => {
+const FLOAT: WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput): IComfyInputSlot => {
     const config = getNumberDefaults(inputData, 0.5);
     return addComfyInput(node, inputName, { type: "number", config, defaultWidgetNode: ComfyNumberNode })
 }
 
-const INT: WidgetFactory = (node: LGraphNode, inputName: string, inputData: any): IComfyInputSlot => {
+const INT: WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput): IComfyInputSlot => {
     const config = getNumberDefaults(inputData, 1);
     return addComfyInput(node, inputName, { type: "number", config, defaultWidgetNode: ComfyNumberNode })
 };
 
-const STRING: WidgetFactory = (node: LGraphNode, inputName: string, inputData: any): IComfyInputSlot => {
+const STRING: WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput): IComfyInputSlot => {
     const defaultValue = inputData[1].default || "";
     const multiline = !!inputData[1].multiline;
 
     return addComfyInput(node, inputName, { type: "string", config: { defaultValue, multiline }, defaultWidgetNode: ComfyTextNode })
 };
 
-const COMBO: WidgetFactory = (node: LGraphNode, inputName: string, inputData: any): IComfyInputSlot => {
-    const type = inputData[0];
+const COMBO: WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput): IComfyInputSlot => {
+    const type = inputData[0] as string[];
     let defaultValue = type[0];
     if (inputData[1] && inputData[1].default) {
         defaultValue = inputData[1].default;
@@ -59,7 +60,7 @@ const COMBO: WidgetFactory = (node: LGraphNode, inputName: string, inputData: an
     return addComfyInput(node, inputName, { type: "string", config: { values: type, defaultValue }, defaultWidgetNode: ComfyComboNode })
 }
 
-const IMAGEUPLOAD: WidgetFactory = (node: LGraphNode, inputName: string, inputData: any): IComfyInputSlot => {
+const IMAGEUPLOAD: WidgetFactory = (node: LGraphNode, inputName: string, inputData: ComfyNodeDefInput): IComfyInputSlot => {
     return addComfyInput(node, inputName, { type: "number", config: {} })
 }
 
diff --git a/src/mobile/routes/graph.svelte b/src/mobile/routes/graph.svelte
index 170c018..ba0bbb0 100644
--- a/src/mobile/routes/graph.svelte
+++ b/src/mobile/routes/graph.svelte
@@ -18,11 +18,11 @@
      lCanvas.draw(true, true);
  }
 
- $: if (app != null && app.lGraph && canvasEl != null) {
+ $: if (app?.activeGraph != null && canvasEl != null) {
      if (!lCanvas) {
-         lCanvas = new ComfyGraphCanvas(app, canvasEl);
+         lCanvas = new ComfyGraphCanvas(app, app.activeGraph, canvasEl);
          lCanvas.allow_interaction = false;
-         app.lGraph.eventBus.on("afterExecute", () => lCanvas.draw(true))
+         app.activeGraph.eventBus.on("afterExecute", () => lCanvas.draw(true))
      }
      resizeCanvas();
  }