A few users of the iOS application have asked for a version of ToneBoard available for macOS or as a Chrome extension. I initially thought the native macOS option was preferable, but after exploring both options, I think a Chrome extension is preferable.

The main reason is that many users use ToneBoard with apps like Duolingo which switch rapidly between e.g. input in Chinese and English. There is no way to tell in an OS input method what kind of web content a user is interacting with. However, in a Chrome extension, it is possible to see whether the currently active input has something like a lang="zh" property (this is the case for Duolingo Chinese input boxes). This makes for a very convenient experience where the input method is automatically selected as in the iOS application.

The extension is actually mostly implemented now, and available in the repo in "/chrome/extension" for anyone who wants to try it. It can be installed as an unpacked extension. That said, I will keep this issue open until the extension is available in the Chrome Web Store.

This is implemented now with Polly audio in main, but the audio DB is too big to simply distribute with the app. I'll need to use on-demand resources or some other mechanism to optionally distribute the data. (Or perhaps wait until iOS text-to-speech improves.)

Some users have expressed interest in displaying candidate characters in random order (instead of the most frequent/likely option first, as it behaves currently) to help practice character recognition.