I spent 10 minutes or so playing around with this and it is impressive. I've also built a couple of small side projects around language learning out of frustration with Duolingo.
I'm around a C1 level in French and am just starting to learn Polish. The audio pronunciations are a great feature here and (at least in French, where I can judge it) the accents are quite good. I can see this being quite useful for my Polish work for learning some of the basics.
Using it a bit more, it doesn't seem that the C1 or C2 level generated sentences are anywhere close to being C1 or C2 level. I'd be curious to understand the sentence generation process and how it is or is not attempting to generate sentences at various CEFR levels.
Agreed I have heard that feedback a few times now. I tried to make sure the A and B levels were pinned down as it was quite verbose in my testing. I'll have a look into C1 and C2 levels. If you have examples I can back test against I'll use them.
Thanks for the feedback. I started with web text-to-speech APIs and beta testers hated the robotic sounds so spent a fair amount of time getting text-to-speech right.
Looking forward to seeing more advanced ML models in the browser as that's how this project started really.
I'm around a C1 level in French and am just starting to learn Polish. The audio pronunciations are a great feature here and (at least in French, where I can judge it) the accents are quite good. I can see this being quite useful for my Polish work for learning some of the basics.