Choona is a guitar tuner with support for custom tunings. FEATURES: Listens as you play a string and indicates whether it is in-tune. Displays the amount to tune each string up/down to reach the correct pitch. Automatic detection of which string is playing. Choose from 20+ common guitar and bass tunings. Save and tune to custom tunings with any combination of strings. Display tuning offset in semitones or cents for improved accuracy. Plays sounds to indicate how a string should sound and when it is in tune. Keep track of your favorite tunings. Support for dark mode and includes true dark theme. Support for multi-window and large screen devices.