The few Reels
that echo.
Paste a YouTube link into your AI agent. It picks the moments, YouTube's own replay data confirms them, and Echo cuts finished Reels with big captions. Free, open source, runs on your machine.
The replay map
The line is YouTube's Most replayed curve, the seconds real viewers rewound. Electric windows are the clips Echo cut, each one still judged on its own.
Works with your agent
Paste a link. Your agent does the rest.
Echo is a set of simple terminal commands with a built-in playbook, so any coding agent can drive it. The agent judges the moments, Echo cuts them, then the agent reviews and fixes every clip.
How it ranks
Judged by AI, confirmed by real viewers.
Agent judgment
Hook, flow, value, shareability, loop.
Replay heat
YouTube's Most replayed curve.
Comment buzz
Top comments quoting a timestamp.
Pace
Speaking energy vs the rest of the video.
Your results
Instagram stats feed back every week.
Time and tokens
Know the cost before you hit go.
Echo only sends your AI the transcript, never the video, so tokens grow with how long people talk, not with file size. Slide to your video and see what a run takes.
Estimates for a typical talking video. The first run on a new computer also downloads the speech model once (a few minutes). On a Claude plan, tokens count toward your usage limits rather than costing money per run. Agents re-read earlier steps as they work, so your app's own meter can show more than the content Echo sends.
About five minutes
It never downloads what it doesn't need.
- 1Prepare
Captions, replay curve and comments. No video yet.
seconds - 2Judge
Your agent reads the brief and scores every moment.
about a minute - 3Cut
Only the chosen ranges download in 1080p.
1 to 2 min - 4Render
Captions, reframing and zooms in one pass per clip.
1 to 2 min - 5Review
The agent checks every clip and fixes weak ones.
seconds each
What the edit does
Every clip leaves finished.
Cold open
The strongest line plays first, then a hard cut back to the start.
Jump cuts and zooms
Silences and filler words go. Framing shifts every few seconds.
Big captions
Word-by-word, ice blue active words, electric keywords.
Speaker reframing
Face-centered crops, split screen for two-person podcasts.
Fix by command
Trim the opening, rewrite the hook, change style in seconds.
Trial reels
Optionally show strangers first and let Instagram promote winners.
Sound and music
Whooshes on cuts, pops on keywords, your music ducked under the voice.
Every format
9:16 Reels, 4:5 feed, 1:1, all inside Instagram's safe zones.
Covers and export
Grid-safe covers with the hook, plus captions ready to paste, in one folder.
Install
One line. Everything set up.
Installs Python, ffmpeg and Echo if they're missing, connects every AI agent on your computer, and checks it all works.
Credits
Designed and built by Madhur Mittal.
Madhur Mittal
Mathematics and Computing at Delhi Technological University, class of 2029. Full-stack, real-time systems, embedded and IoT.
Built on remarkable open-source work. Thank you to every maintainer.