Does voice-following work in Safari or Firefox?

Support is limited and less reliable than Chrome. For voice-following we recommend Chrome or another Chromium-based browser; otherwise use auto-scroll.

What do I need for offline, on-device voice?

Chrome 139 or newer, with on-device recognition enabled and the one-time language model downloaded.

Does it work on mobile browsers?

Yes — auto-scroll works on mobile, and voice-following works on mobile Chrome with microphone permission.

Guides

Browser support

letter maps runs entirely in your browser, so what works depends on your browser. Here's the current picture.

	Auto-scroll	Voice-following	On-device voice
Chrome 139+	Yes	Yes	Yes
Chrome / Edge (older)	Yes	Yes	No
Other Chromium browsers	Yes	Usually	Varies
Safari	Yes	Limited	No
Firefox	Yes	Limited	No

What this means in practice

Auto-scroll works in every modern browser, including mobile. Voice-following relies on the browser's speech recognition, most reliable in Chrome and other Chromium browsers. On-device (offline) recognition is newest and currently needs Chrome 139 or later.

Test your browser →

Frequently asked questions

Does voice-following work in Safari or Firefox?: Support is limited and less reliable than Chrome. For voice-following we recommend Chrome or another Chromium-based browser; otherwise use auto-scroll.
What do I need for offline, on-device voice?: Chrome 139 or newer, with on-device recognition enabled and the one-time language model downloaded.
Does it work on mobile browsers?: Yes — auto-scroll works on mobile, and voice-following works on mobile Chrome with microphone permission.