About text-to-speech (TTS)
This site uses the browser's built in TTS api, which may rely on the TTS of your operating system (Linux & mobile).
PC
Works best on Chrome & Edge (both have built-in TTS). Firefox relies on the operating system TTS, which may be very underperforming, especially on Linux.
Android
TTS must be enabled on your phone! Google's default TTS is very good. Works well with Chrome, Edge and even Firefox. May not work at all on phone manufacturer custom browsers.
Apple
Since I don't own any apple devices I have not tested it.
ありがとう
Hana