Pluck a string — or drop in a recording — and the hippo tells you how far off each one is, in cents, and checks it off when it rings true. Guitar, bass, ukulele, violin, cello, banjo, mandolin, four winds/brass, 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.
Nothing locked in yet this session.
No saved sessions yet — one gets shelved each time you stop the mic after tuning a string.
Space start/stop · S strobe · 1–6 pick string · ↑↓ A4
The whole tuner is Web Audio running on your own hardware — the same detector whether you pluck into the mic or drop in a recording. 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.
Drop an MP3, WAV or M4A and the same detector walks the whole file, matches every confident moment to a string in your tuning, and reports each one's median offset in cents — plus a pitch-over-time strip so you can see where it wandered.
Standard, Drop D, half-step down, Open D, Open G, DADGAD, 5-string bass, baritone uke, and more — plus flute, B♭ clarinet, E♭ alto sax and B♭ trumpet with honest written-vs-sounding readouts. Chromatic mode covers everything else.
Equal by default. Switch to just intonation or Pythagorean around a root note of your choice and every target shifts by its real interval offset — useful for drones and reference tones, not for fretted instruments (their frets are cut for equal temperament).
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.
Every string you lock gets logged with its cents path and timestamp, exportable as CSV. Stop the mic and the session shelves itself on this device — a running record of what you've tuned and when.
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?"
Below 88% detection confidence it shows a dash, not a guess — live or from a file. 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. We measured it, with the numbers.
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. Flute, B♭ clarinet, E♭ alto sax and B♭ trumpet join as fixed-pitch wind/brass presets, 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 — a muted or fading string, a pluck too quiet to hear, heavy background noise. The dash means "give me a cleaner pluck", not "broken". Two strings ringing together are different: they can show a note an octave low, so tune one string at a time.
Yes — switch to "From a file" and drop an MP3, WAV or M4A. The same detector walks the file offline, matches confident moments to the nearest string in your tuning, and reports each string's median cents offset. A clean, mostly-solo recording under about 40 seconds gives the best read.
Flute, B♭ clarinet, E♭ alto sax and B♭ trumpet are built in. The tuner locks to the real acoustic pitch, then shows the written note a player reads for it — a B♭ trumpet reads concert B♭ on the meter while the readout notes it's written as C.
Equal temperament (the default) is what every fret and valve is built for. Just intonation and Pythagorean tuning instead favor pure ratios to a root note you pick, shifting several targets by a few cents — most useful for drones and reference tones, not for tuning a fretted instrument.
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.
WindsTransposition isn't a bug in band music — it's 300 years of instrument-maker convenience, explained with a tuner in hand.
Open string vs 12th fret, measured in cents per string — finds the "tuned but still sour" problem no tuner alone can.
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.