Excellent
Also I noticed an error in the app, the word 「衣服」has the wrong reading. It should be 「いふく」but the app says it's 「いるい」(衣類)
Helpful
Can be improved
Essential to my learning.
Response from developer
Thank you so much for taking the time to review!
Furigana problem
Response from developer
Update: Apple has fixed their bug in iOS 11! The app now works as it did in the past. Really sorry about this. It is caused by a recently-introduced bug in Apple's iOS operating system. I reported it months ago and Apple confirmed its existence. Waiting for them to fix it now. In the meantime, you can use the rōmaji setting (although I admit this is inferior to the furigana setting).

