App for Kana Writing Practice

Is anyone aware of a good free mobile (Android) app for pracicing / memorising **writing** Hirigana and Katakana characters?

I do not want one that teaches you that か = KA. I already know and recognise all the characters, and don’t want to go through lessons for each one – I just need help writing them from memory.

What I’m looking for is the ability to select a selection of characters up front to practice, then you’re given the romaji and asked to draw the character correctly (with the app reconising if it was drawn properly with the right stroke order).

I have tried a lot and so far I have found one called Write in Japanese by Artsiom Anikeyenka which is almost perfect, but only lets you do every single character in sequence, without letting you choose which ones to study.