Limitations
letter maps does one thing well, but it isn't magic. Here are its real limits so you know what to expect before a shoot.
Voice-following depends on your browser
- Voice mode needs browser speech recognition, most reliable in Chrome and other Chromium browsers; support is patchy elsewhere.
- On-device (offline) voice needs Chrome 139+; older or other browsers fall back to cloud recognition or auto-scroll.
- Recognition quality drops with heavy background noise, cross-talk, or a distant microphone.
Practical constraints
- No video recording — letter maps is a prompter; use your own recorder or OBS.
- Language coverage follows what your browser's speech engine supports.
- Unusual words, names or heavy accents can occasionally throw off following — pausing or stepping recovers it.
- Scripts live only in your browser, so clearing site data or switching devices means they don't carry over. No cloud sync or team sharing by design.
When auto-scroll is the safer bet
On a browser without good speech recognition, in a noisy room, or if you'd rather not use a microphone, switch to auto-scroll: set a fixed speed and read to it — fewer moving parts, no recognition involved.
Try it and judge for yourself →
Frequently asked questions
- Why doesn't voice-following work in my browser?
- It likely lacks reliable speech recognition. Use Chrome or another Chromium-based browser, or switch to auto-scroll mode.
- Can letter maps record my video?
- No — it's a prompter only. Record with your phone, camera or OBS alongside it.
- Are my scripts backed up anywhere?
- No. They live only in your browser for privacy, so keep your own copy of anything important.
Related: Browser support, Requirements, Compare teleprompters