I've only tried a few lessons on this app and I love it so far! Especially love that it shows the stroke order, and an example of a word that uses the letter.
I have two minor complaints though:
The first is that I really really wish there was some way to see the written translation of the example words, instead of just having a picture.
For instance: when learning to write Hindi, there's the word "akshar" given as example for the letter "a". There's a picture next to the word that could be interpreted as meaning "translation", or "transcription", or "language", and I don't know which it's supposed to be.
The second complaint isn't very important, just that I wish it was written somewhere which tone class the different Thai consonants belong to.
Overall great app, very grateful it exists!