Mortiflix is a free, open-source app (AGPL-3.0 licence) that works like a small motion design studio. You write a brief, and Claude builds the video in stages: the script, style frames, transitions, an animatic, music and the final. At every stage Claude stops and waits. Only you can approve it, and you can pin a note on the exact spot of a frame or the exact moment of a video. The next version answers every note.
Here is how it works, how to set it up, how to make your first video, and the catch.
How it works
- Four kinds of video today: an explainer (brief, script, style frames, transitions, animatic, music, final), a social short, a logo sting and a song.
- A Claude session works until it has something for you to review, submits it, and stops. Waiting on you costs nothing.
- It runs on your own Claude Code login (your plan pays) or your own Anthropic API key (you pay per token).
- Videos are built in Remotion and every render is checked with ffmpeg for black or frozen frames and loudness.
Free, for your email
Get the full setup steps + the copy-paste setup prompt
The rest of this guide (4 more sections) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
Unlocks: Step 1: install it · Step 2: make your first video · The catch · Sources
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