Ship a narrated product demo without recording a thing.
Understudy turns a URL or a screen recording into a branded, narrated walkthrough — voiced by AI and perfectly synced, because the audio drives the video. Edit the script, never the timeline.
No recording, no re-takes, no manual audio-to-video syncing.
Powered by Claude · ElevenLabs · Playwright
Two ways in. One polished video out.
Start from a live page or a recording you already have — Understudy does the narration and the editing either way.
From a URL
Paste a link and say what to show. Understudy scans the page, scripts the scenes, and films a smooth, slow-scrolling walkthrough.
From a recording
Upload a screen capture of any app — even behind a login. Claude watches it and narrates the flow, start to finish.
The audio is the clock.
Every other tool makes you record a screen, then fight to line up a voiceover. Understudy flips it: the narration is generated first, with exact word-level timing. The scroll, the highlights, the captions — all driven to match the voice automatically.
Change your mind about a sentence? Edit the text. The on-screen timing recomputes itself. You never touch a video timeline.
Everything a good demo needs.
Audio is the clock
Narration is generated first. Every scroll, pause, and highlight is timed to the spoken words — so it never feels off.
Edit text, not video
Reword a line and the on-screen timing recomputes itself. No scrubbing a timeline, no re-recording.
On-brand by default
Your logo, colors, and fonts on the intro and outro cards, plus a call-to-action and captions.
Logged-in demos
Capture authenticated product flows securely with a saved session — show the real app, not a marketing page.
Word-perfect captions
Captions land on the exact word being spoken, because they share the same timing as the voiceover.
Built for teams
Shared workspaces and nested folders keep every demo organized for the whole team.
How it works
Describe it
Drop a URL and a short gameplan, or upload a screen recording. Pick a voice and a brand.
Claude scripts it
It writes the narration scene by scene and pinpoints exactly what to highlight, and when.
Voice sets the pace
ElevenLabs narrates and returns word-level timing. The visuals are driven to match the voice.
Render on brand
The cloud renders a polished MP4 — your logo, colors, captions, intro and outro, ready to share.
Describe the demo. Get the video.
Make your first narrated, on-brand demo in minutes — no editing timeline required.