I loaded the webpage then unplugged from the Internet and tried to play the demos. The speech synthesis was actually done over the Internet by default, and fell back to native platform only when offline, it seemed.
The speech recognition did not work offline at all, though we know it should be eventually possible thanks to Android's offline dictation download (iirc?).
The speech recognition did not work offline at all, though we know it should be eventually possible thanks to Android's offline dictation download (iirc?).