---
title: "Set Up RTX Spark as Your Always-On AI Hub — Creators"
canonical: "https://build.nvidia.com/playbooks/ai-hub/creators.md"
---

# Run ComfyUI on RTX Spark

ComfyUI runs generative AI models for images and video. With ComfyUI on RTX Spark, you build and run workflows from any PC in your home while RTX Spark runs the models.

**Before you start:** complete the **Remote Access** tab.

# Step 1. Install ComfyUI on RTX Spark

On RTX Spark, follow Steps 1 and 2 of [How to Use Creative AI Models Locally](https://build.nvidia.com/rtx-spark/agents-for-creators/local-creative-models) in the Create with an AI Agent playbook, then return here:

- **Step 1** installs Comfy Desktop.
- **Step 2** downloads a model and generates a first image, which confirms that ComfyUI works on RTX Spark.

You do not need Step 3 of that tab for this setup.

# Step 2. Let other PCs connect

By default, ComfyUI accepts connections only from RTX Spark itself.

1. In Comfy Desktop on RTX Spark, go to the home screen that lists your instances. On the **ComfyUI** card, highlighted in the image below, select **⋮**, then **Manage**.

![Comfy Desktop home screen with the ComfyUI instance card highlighted](https://assets.ngc.nvidia.com/products/api-catalog/rtx-spark/comfy-desktop-instance.png)

2. On the **Startup Args** tab, add `--listen` to **Startup Arguments**, then start the instance again.
3. If Windows Firewall asks, allow ComfyUI on private networks.

ComfyUI is now available to your other devices at `http://<rtx-spark-address>:8188`. In place of `<rtx-spark-address>`, use RTX Spark’s device name. To connect away from home, use its Tailscale name (**Remote Access** tab, Step 4).

> [!NOTE]
> ComfyUI has no sign-in of its own, so anyone who can reach the address can use it. Keep it on your home network or behind Tailscale. Do not forward the port on your router.

# Step 3. Connect from another PC

Use any of these:

- **A browser.** Open `http://<rtx-spark-address>:8188`. You get the full ComfyUI interface, and your workflows run on RTX Spark.
- **Comfy Desktop.** Install [Comfy Desktop](https://comfy.org/download) on the other PC. Select **New Instance**, then **Remote Connection**, and enter RTX Spark’s address and port `8188`.
- **An agent.** Connect the official [ComfyUI MCP server](https://docs.comfy.org/agent-tools/mcp) to an agent on the other PC, with `COMFYUI_URL` set to `http://<rtx-spark-address>:8188`.

# Step 4. Check your setup

1. On another PC, open `http://<rtx-spark-address>:8188` in a browser.
2. Run a template workflow. The generated image should appear on the other PC.

Comfy Desktop does not run in the background. After RTX Spark restarts, sign in through remote desktop and open Comfy Desktop again.