[iamsrp]

Dexter has a couple of different input systems: PocketSphinx and DeepSpeech.

PocketSphinx seems to have better language coverage but lower accuracy than DeepSpeech, which only has English and Mandarin Chinese.

DeepSpeech was not great about 2 years ago when I first started Dexter and, being a Brit, I had to fake an (awful) American accent to make it work. It's come on well in that time though; I can use my own voice now, which is a relief to those near by. No clue how good its Mandarin recognition is however.

Other folks in surrounding threads have flagged Kaldi which I'll try to take a look at as well (though it also looks to be only English and Mandarin too).