Paste two video URLs, pick a moment in each, choose a layout, and download a 1080×1920 MP4. It's self-hosted on one Mac Mini, reached through a Cloudflare Tunnel, built over two weeks in August 2026.
A comparison video is five careful decisions, not one edit.
Two clips have to line up on the moment that matters, sit in a layout that makes the comparison obvious, and hold captions without one clip going blank while the other keeps playing.
One workspace, four layouts, a worker that outlives the tab.
A single-page workspace replaced an earlier five-step wizard. The web app only writes a job row and returns; a separate worker polls SQLite and renders with FFmpeg and Remotion, so a render survives a browser refresh.
The shorter clip freezes on its last frame in a split layout, so the comparison pane never goes blank while the longer one keeps playing.
A caption never hides behind a title card. The band claims its strip first; the card lays out around it.
A caption band and a text card can run together: the band's height comes out of each pane rather than sitting over it, so a 1920px frame with a 220px band still leaves 850px of clear video each side. The card composites first, then the band goes on last, holding its strip for the card's whole duration.