jub0t/Concat
Beta: The truly free, open-source, local-first, cross-platform video editor. Scriptable through a JSON-RPC API & MCP.
Build with Backblaze B2
SDKs, agent skills, IDE extensions, and reference pipelines from Backblaze Labs. All open source.
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Where it stands
Rank, growth pace and release cadence relative to everything GStars tracks.
Ranks #2 among Self-Hosted repositories ranked this week; #44 of 182 repositories with measured growth this week (top 24%).
5 releases in the last 90 days, the latest today, with 48 contributors on GitHub.
Peaked at #44 in the weekly ranking the week of Nov 1, its best in the past year.
Use Cases & Benefits
- Provides a free, open-source, cross-platform video editor as a local-first CapCut replacement with advanced editing features and AI-powered tools.
- Ensures complete offline functionality with no watermarks, accounts, subscriptions, or uploads, preserving user privacy and control over footage.
- Use for creating TikTok, Instagram Reels, and YouTube Shorts with automated captions, text-to-speech, and multi-track editing.
- Use for automating video editing workflows via its JSON-RPC API and built-in MCP server for AI agent integration.
- Use for professional-quality video projects requiring 4K export, GPU-accelerated effects, background removal, and keyframe animations on multiple platforms.
Should you depend on it?
License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.
License
AGPL 3.0
Network copyleft: like the GPL, and also triggered by offering the software over a network.
Community files
- README: present
- Contributing guide: present
- Code of conduct: present
Watch-outs
- AGPL-style copyleft also applies when the software is offered over a network.
General guidance from repository metadata, not legal advice. How we score
From the README
The free, open-source, cross-platform CapCut replacement.
Concat is a free, open-source video editor and a CapCut alternative for macOS, Windows, Linux and Android. It covers what people actually open CapCut for: auto-captions, text-to-speech, background removal, keyframe animation, effects and titles, multi-track cutting, 4K export. With none of the catches: no watermark, no account, no subscription, no upload.
Everything runs locally on a native Rust engine with a GPU compositor. Install it, drop in footage, cut. The AI models for captions, voices and cutout download once from Settings and work offline after that. Your footage never leaves your disk.
Good for: TikTok, Reels and Shorts, YouTube videos, tutorials and screen recordings, podcast clips, memes.
Also for machines: a built-in MCP server for AI agents (
concat --mcp, set up) and a JSON-RPC API for scripts, so they can cut video with it too.
Daily snapshots
Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots
+2,878 stars over 11 days across 12 snapshot days; best day +369 on Oct 29.
Forks
1.8K+375
Open issues
234+19
Compared with peers in Self-Hosted
Fastest-growing repositories GStars tracks in this cohort for the week of Nov 1, by 7-day star growth
| Repository | Stars | +7d | Health | Last release |
|---|---|---|---|---|
| debpalash/VoiceStudio | 102.0K | +7.7K | 64 | 10 days ago |
| milind-soni/OpenMausBot | 13.5K | +6.0K | 45 | today |
| DuarteSantos8/openGym | 19.7K | +2.4K | 60 | 2 days ago |
| jub0t/Concat | 14.4K | +1.8K | 45 | today |
| elie222/rakazo | 7.2K | +922 | 59 | 26 days ago |
| vxcontrol/pentagi | 33.5K | +712 | 38 | 31 days ago |
| Category median | 19.7K | +2.4K | 59 | — |
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