I built an AI scene partner for actors who rehearse alone
I'm a solo dev and I just launched Line Echo on Product Hunt today.
The problem: Actors need someone to read the other characters' lines when rehearsing. Options are: beg a friend, pay $20-50/session for a reader, or use an app with flat robotic voices that kill any real emotion.
There are tools out there - coldRead, Linus, ActingPal, Rehearsal Pro - but after digging into all of them, I kept hitting the same gaps:
- Every AI reader delivers lines in one flat tone. No emotion, no context. An angry line sounds the same as a tender one.
- Most are iOS-only. No web app, no cross-platform.
- Many require manual setup - record your own audio, manually tag characters, etc.
- Cloud-based speech recognition means your audio gets sent to a server. Actors on contract care about this.
What Line Echo does differently:
- Sentiment-aware voice delivery - AI analyzes every line for emotion (angry, sarcastic, tender, desperate - 16 total) and reads it back with matching delivery. No other tool does this.
- Full automation - Upload a PDF or scanned images of the screenplay, AI detects characters, extracts dialogue, assigns sentiments. Ready to rehearse in under a minute.
- On-device speech recognition - Runs in your browser via WebAssembly. Your audio never leaves your device.
- Web-first - Works on any device with a browser. No app store, no install.
- Free tier - Try it without paying.
Stack: Next.js 16, NestJS, PostgreSQL, Drizzle ORM, WebAssembly, Google Cloud TTS, Cloudflare R2
Try it at https://lineecho.app
Also live on Product Hunt today: https://www.producthunt.com/products/line-echo
Would love feedback - especially on the rehearsal flow and voice quality. Roast it if needed.