Pluck a string — the hippo hears which one it is, shows how far off you are in cents, and checks it off when it rings true. Guitar, bass, ukulele, violin, cello, banjo, mandolin, or anything chromatic.
Mic → your browser → this display. Nothing recorded, nothing uploaded.
Tap a string to hear its target and lock onto it. Strings you tune get a ✓ — and a little buzz on phones.
Space start/stop · S strobe · 1–6 pick string · ↑↓ A4
Everything runs in your browser with the Web Audio API. No app, no account, no "premium tunings" — the sites ranking above us gate features behind signups; we think that's a strange thing to do to someone holding an untuned guitar.
It compares your note against the strings of your chosen tuning — not just the nearest chromatic note — so Drop D reads D, not "flat E". Lock mode pins one string when you want no surprises.
Standard, Drop D, half-step down, Open D, Open G, DADGAD, 5-string bass, baritone uke, and more. All free. Chromatic mode covers everything else.
The needle for speed, the strobe for the last cent — its fine band moves 4× faster and freezes dead when you're there. The display pros pay for.
Hold a string in tune for a moment and it's checked off — with a haptic pulse on phones. No more "wait, did I do the D?"
Tap any string to hear its exact target, recalculated live if you change the A4 reference (415–466 Hz for baroque or orchestra work).
Below 88% detection confidence it shows a dash, not a guess. The device report tells you if your phone kept noise suppression on. No fake needles here.
Two things every mic tuner should tell you and almost none do. First: the initial half-second of a pluck is attack noise, not pitch — let the string ring and the reading settles. Second: phone mics roll off below ~80 Hz, so a low bass E (41 Hz) is read from its overtones. That works fine, but if a 5-string's low B acts shy, tune the octave harmonic instead — touch the string lightly at the 12th fret.
And if your room is loud, the tuner refuses to guess. That's a feature. A confident-looking needle in a noisy room is fiction.
Completely — no account, no trial, no locked tunings. The sites above us in Google gate features behind signups; instant use is the whole point here.
No. The mic feeds the Web Audio API in your browser; analysis happens on-device and nothing is recorded or sent. It even works offline once loaded.
Better than ±1 cent on a clean ringing string — finer than a tuning peg can move. Vibrato, chords, and noise reduce that, and the tuner says so instead of pretending.
19 across guitar, bass, ukulele, violin, cello, banjo and mandolin — including Drop D, half-step down, Open D/G, DADGAD, 5-string bass, and baritone uke. Plus chromatic mode for anything with a pitch.
A pro-style view: the band drifts right when sharp, left when flat, and freezes at pitch. The fine band runs 4× faster so the final cent is visible as a slow crawl. Press S to flip between needle and strobe.
Below 88% detection confidence any reading would be a guess — muted strings, several notes at once, background noise. The dash means "give me a cleaner pluck", not "broken".
The right order, the peg trick, and what new strings do for the first two days.
TuningsWhat each one is for, and which songs to try first.
UkuleleIt's the strings, not you. What stretching actually does and how to speed it up.
EarsThe 5th-fret method, harmonics, and why doing both makes you better.
Twelve steady reference notes across three octaves — tune by ear, the old way.
On this siteAudio-clock click, 30–240 BPM, tap tempo, accented signatures.
On this siteA sustained root note (with optional fifth) for intonation practice.
On this siteTwelve perfectly tuned open chords — the after-tuning check, and an ear-training reference.