As a contributor to Tatoeba, I'm always interested in checking out how people use our data.
The interface needs work to be usable on mobile, but I guess you know that.
I'm not sure whether the TTS you're using is really good enough to be usable for learning a language. I tried it in German and noticed quite a few TTS bugs, like pronouncing "Tu" as if it were an acronym "TU" instead of the verb "Do", as well as switching to an English pronunciation next to English names (pronouncing "Hallo Roger" more like "Hello Roger").
Oh, thank you for your contributions! Mobile, we're planning a RN app (site is MobX/React), but we got our hands full at the moment (who wants a job?).
TTS, I used to be of the opinion that TTS is something that should be kept far away from langauge learners. But, it got so damn good: https://azure.microsoft.com/en-us/services/cognitive-service...
At least for many langauges. Didn't check the German much, interesting. For Hungarian, it screws up question intonation. But often it just seems completely human-like.
I was concerned about the license for the audio recordings, and I assume recording quality could be mixed, but I'll take a more careful look.
The interface needs work to be usable on mobile, but I guess you know that.
I'm not sure whether the TTS you're using is really good enough to be usable for learning a language. I tried it in German and noticed quite a few TTS bugs, like pronouncing "Tu" as if it were an acronym "TU" instead of the verb "Do", as well as switching to an English pronunciation next to English names (pronouncing "Hallo Roger" more like "Hello Roger").
Tatoeba also has many recordings in quite a few languages (e.g. German https://tatoeba.org/en/audio/index/deu ) You should try using them if possible. For download instructions, see https://tatoeba.org/en/downloads