About this app

Uku is a ukulele tuner and chord library for GCEA tuning — fast, accurate, and beautifully calm. Tune your soprano, concert, or tenor ukulele in seconds, then learn chords with clean fretboard diagrams. Fully offline, free, no ads. A ukulele tuner should be the fastest, calmest thing on your phone. Uku is built around a single shape that does all the talking. Play a string and the shape comes alive — it morphs from triangle to pentagon to a soft cookie, then sharpens into a needle that tilts flat or sharp until the note locks in. A gentle buzz tells you you've landed. No cluttered dials, no flashing numbers, no reading a manual. One shape, and you're in tune. TUNER • Real-time chromatic pitch detection for standard GCEA ukulele tuning • Works for soprano, concert, and tenor ukulele • A bubble-level strip showing exactly how far flat or sharp each string sits • Haptic confirmation the instant a string lands in tune — switchable in Settings • Fully offline: no account, no sign-in, no connection required CHORDS • 30 ukulele chord shapes — majors, minors, sevenths and maj7s across the keys • Clean fretboard diagrams, read in GCEA order • Perfect for beginners learning their first songs • Enough to carry you through your first hundred songs DESIGN • Material 3 throughout, with expressive shape morphing and motion • Material You dynamic colour — Uku takes its palette from your wallpaper on Android 12 and above • Light theme, dark theme, or follow your system • Designed to be genuinely nice to look at while you tune PRIVACY • Microphone audio is analysed on your device, then discarded — never recorded, never stored, never uploaded • No ads, no paywalls, no account • Anonymous crash and usage analytics only, so bugs get fixed Whether you're a complete beginner picking up your first ukulele or a seasoned player who just wants a tuner that gets out of the way, Uku keeps things simple. Tune up, learn a chord, play a song. Free. Pick up your ukulele and tune up