Tuner
Play any string and it works out which one it is, then shows how far off you are in cents. Chromatic mode for anything that is not a guitar. Reference pitch adjustable from 415 to 466 Hz.
Tunings
Standard, Drop D, Drop C, DADGAD, the open tunings, 7-string, bass, ukulele, banjo, mandolin and the bowed strings — plus any tuning you build yourself.
Metronome
20–300 BPM with timing that does not drift, 2/3/4/6 beats per bar, quarter to sixteenth subdivisions, accented downbeat and tap tempo.
Chords
Shapes worked out for the tuning you are actually in, not looked up from a standard-tuning table. Several playable voicings per chord, each one checked against what a hand can hold.
Ear training
Intervals, chord types, pitch matching against the live tuner, and tuning a string by ear with the meter hidden.
Nothing else
No account, no analytics, no ads. The app is not even granted internet permission, so nothing can leave your phone. The microphone is used to hear the note and nothing more.