It's good.
I just read the comment from the last user. I agree with her/him in some points. It doesn't explain very details in each grammar point. However it shows alot of examples, I think this app is good for someone who has some German knowledge already, around level A2-B1. Of course if u dont know anything about German before, it's better to go to study with a teacher. About the price, I think it's ok, maybe its a bit expensive, but I know the authour/programmer had to work alot. In general, I would give it 4 in total 5. Hope it will be improved more in future.
