u/Direction_Mountain

Scumble is a free, open-source (GPL-3.0) desktop editor for AI inpainting on Windows/Linuc (MacOs soon...), built around the FLUX models.
The trailer shows the idea: draw a box, say what goes in it, and the picture fills it as a layer of its own

How FLUX runs in it

• Local: FLUX.2 Klein 4B / 9B on your own ComfyUI through a ready recipe (the crop plus up to three reference pictures), or any FLUX workflow imported as a recipe. Scumble crops, sends, stitches and colour-matches the result into a new layer.
• API: FLUX 3 Image, FLUX.2 [pro] / [flex] / [max] / [klein] and FLUX.1 Fill [pro] on Black Forest Labs’ own API with your key, or through fal, Replicate, WaveSpeed, OpenRouter, Comfy Cloud and Comfy Router. Keys stay in the OS credential store; no account, no subscription.
• FLUX 3 boxes: a selection goes out as a FLUX 3 bounding box, and on an empty canvas you draw boxes with a caption each, so a whole composition comes from one prompt with the layout you drew. Reference layers are named in the prompt as u/img1, u/img2 and sent the way each FLUX endpoint takes them.

The editor part: layers with masks, blend modes and groups, selection by text (SAM), by point, by depth or colour range, filter layers (curves, grain, film looks), text layers, colour match per layer, pictures up to 15k pixels, export to PNG / TIFF / layered PSD and ORA. Every result stays a layer, nothing is baked in.

Agents: every command is an MCP tool, so Claude Desktop (one-click extension) or Claude Code can drive the same window on screen.

The trailer was made with FLUX 3 Image for the pictures and FLUX 3 Video for the clips. Thanks to Black Forest Labs for the models and the API.

Download (installer, portable zip, Linux builds): https://github.com/DenRakEiw/scumble/releases/latest
Source: https://github.com/DenRakEiw/scumble ·
Website, videos, manual: https://www.denrakeiw.com/scumble

Which FLUX workflow would you want as a one-click recipe next?

***Posted by the project’s developer; questions welcome.