Idk how duolinguo works (at all), but if the app can play the sounds for you and judge on your pronunciation, that would be quite enough to do the job. If it can handle mandarin (idk if it can) than any tonal based language is fair game.

I would think any decent speech to text could do a decent job determining pronunciation, if there isn’t a dedicated thing for that… either it registers or it gets garble and you try again.