Please consider adding a Sort by Last Failed search option. This would be very useful to me and probably many other people to be able to grind the Kanjis we struggled with.

For now I'm using the "Most Difficult First" which is also useful, but in some sessions/some cases, Sort by Last Failed would be even more useful. (Both are very useful in different situations)

Thanks in advance! Your app has been of a great help to me so far, I'm grinding my kanji writing skills as this is required for the language school I will be joining in April

I suggest making an account system, a simple one to log-in via e-mail and pass.

Since ringotan will become paid figure something out so only one free account per ip for example or something and so on.. This will help save progress if a device is lost.