OneTune: Instrument Tuner

Tune, keep time, and practice from your own scores. OneTune brings an offline instrument tuner, metronome, score library, and beginner knowledge references together on iPhone and iPad. Choose from 49 instrument and tuning presets plus Universal Tuning (chromatic mode), covering guitar, ukulele, bass, bowed strings, mandolin, banjo, Chinese strings, and transposing wind instruments. Read pitch, frequency, and cents on a clear visual gauge. Select a target string to begin listening immediately; reference tones play only when you request them. Practice with a 30–240 BPM metronome, tap tempo, four time signatures, quarter-note, eighth-note, triplet, and sixteenth-note subdivisions, and an optional first-beat accent. Open the Knowledge tab for 24 guitar and ukulele chord diagrams, 120 scale combinations across 12 roots and five scale families, and 15 illustrated beginner lessons. Explore strings and finger placement, tuning, notes and cents, time signatures, rhythm, tablature, and concert versus written pitch. Chord and scale diagrams support right-handed and left-handed views, with offline audio previews. Import PDF scores or score photos into your local library. Organize and favorite scores, read pages, add pen or highlighter marks, and erase unwanted annotation strokes with undo and redo. Share the original or an annotated PDF. Back up your library and restore it locally. Universal Tuning, standard guitar, standard ukulele, and concert-pitch wind tuning are free. A yearly Pro subscription or one-time lifetime purchase unlocks the full preset library, adjustable A4 reference pitch, and precision confidence controls. Add Home Screen widgets to check saved tuning notes, A4 reference pitch, tempo, and beat count, then open the tuner or metronome with a tap. Widgets show saved settings; they do not measure live sound or play a beat in the background. Supports iOS 16 and later, with compact controls and layouts for iPhone and iPad. Tuning, rhythm practice, score reading, and knowledge references work offline. Microphone audio is analyzed in memory on your device, never recorded or uploaded. No account, in-app ads, or third-party tracking. Terms of Use: https://oneapps.studio/terms New for kalimba: 17-key C-major, 21-key C-major, and 17-key B-major presets with exact target octaves. A 12-hole alto-C ocarina mode helps you practice breath-controlled intonation rather than mechanically retune the instrument. Standard 17-key C kalimba and alto-C ocarina modes are free. Choose a piano metronome sound, add a one-bar count-in, or gradually increase tempo after a selected number of bars until your target is reached.