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