AI generated app, Ew. Also, furigana isn't what you think it is. Furigana is specifically the READING AID ABOVE KANJI. What you really meant was just "kana".

Interesting concept.

I've been doing the same kind of drill with ChatGPT. The disadvantage is the interface, but I can direct it to focus on what I'm learning or want to reinforce, etc.

Nice work! I enjoyed it.

On mobile (safari) there’s some quirk where the UI is allowed to zoom in, maybe in response to what is perceived as a double tap, but is just me typing on the keyboard.