Perfect for what I need it for: Improve my pitch accuracy when singing. Bugs/wishes: The rhythm feature is not useful because one only sees the bars after they happened, and there is no metronome. On upgrade to the ad-free version, it loses all settings. The scale setting is awkward (why C♭ in between C and C♯?) and not correctly implemented (e.g. B♭ still displays as A♯). I wish one could change the hardcoded time resolution and the tuning system (to other temperaments such as just intonation or slendro).