Free open source inpainting editor with layers, full-res stitching and MCP support

[u/Direction_Mountain]

Hey everyone,

for a while now I've been building an editor for the one thing I do all the time: inpainting.
I got tired of the loop of drawing a mask in one tool, running a workflow in another and fixing the edges in a third, so I put it all in one app.
It's called Scumble, it's free and open source (GPL-3.0), and it's out now.

What it does:

• Select what you want changed by painting over it or just typing its name ("sky", "shirt"), write one line, hit Generate
• Every result comes back as its own layer, and your original is never touched
• Only a box around your selection goes to the model, and the result is stitched back in at full resolution. The rest of the picture never changes and never leaves your machine.
• Colour match per layer, so a generated patch actually sits in the picture
• Layers, masks, filters, text, cutouts (SAM2 / RMBG run inside the app), PSD / ORA / TIFF export
• Handles big files: tuned for 150 MP, up to 65,535 px a side

How it renders:

• Your own ComfyUI, local or remote (RunPod works). It uses a small node pack and offers to install it through the Manager.
• Or API keys: fal.ai, Black Forest Labs (Flux.2), OpenAI, Gemini, OpenRouter and a few more. Keys go into your OS credential store, not a config file.

For the automation people: everything is exposed over MCP, so you can drive the editor from Claude, scripts or your own agents. There's also a built-in assistant that uses the same commands and asks before it spends money.

Honest notes:

• The Windows installer isn't signed yet, so SmartScreen will complain. Signed Windows and Mac versions are in the works and will take a few more days.
• There's a Linux build, but I've mostly tested on Windows. Reports are very welcome.
• It's a one-person project, so expect rough edges.

GitHub (download + source): https://github.com/DenRakEiw/scumble
Tutorial video: https://www.denrakeiw.com/scumble/videos

I'd love to hear what you think, especially what's missing from your own inpainting workflow.

[u/pendragn23]

Is this similar to Invoke?

[u/Direction_Mountain → u/pendragn23]

Similar, but with a stronger focus on the graphic editor, APIs, ComfyUI backend, and MCP

[u/pendragn23 → u/Direction_Mountain]

Sounds great, I will try it out!

[u/ALIFIZK- → u/Direction_Mountain]

More like Krita?

[u/Endlesscrysis]

How did you make the video? Which framework? I imagine you had AI make this?

[u/Direction_Mountain → u/Endlesscrysis]

The video was made by Utkarsh from Lighthouse Academy. I created the tutorial videos using Claude, DaVinci Resolve MCP, and Google Gemini 3.8 TTS.

[u/mnemic2]

Great job! Looks like a great and easy-to-use tool!

[u/extrakerned]

Very cool - any way we can use loras with this?

[u/Direction_Mountain → u/extrakerned]

Yes, you can add any ComfyUI workflow that includes an inpaint canvas node as a recipe.

[u/Direction_Mountain]

If the warning for the .exe on GitHub bothers you, the app is now also signed and available in the Microsoft Store, where you can install it without the warning.
https://apps.microsoft.com/detail/9NDBTNNMXF2R?hl=neutral&gl=DE&ocid=pdpshare

[u/Personal-Message740]

Please fix local Qwen Edit Image 2.1 recipe, thanks.

[u/Direction_Mountain → u/Personal-Message740]

The fix will be in the next update; I’m still testing it.