Sound playback and usability issues
This should be a great accompaniment to the books, but I find it suffers from three problems: 1. The sound playback (speaking the word on the card) doesn’t work if the phone is on vibrate. As manually trigger audio playback, it would use audio volume, not ringer volume. 2. The touch targets on the cards are widely spaced and hard to use one handed as a result. 3. The furigana on the Japanese side of the cards is too small - I know the books are targeted at a college age demographic but they don’t have to be *this* small. The serifed font just makes this worse.