Play a note near the microphone and the tuner tells you which note it is and how many cents sharp or flat. It runs in the browser, on phone or computer, with nothing to install.
Tap “Turn on microphone” and play a note.
Sound is analysed on your device. Nothing is recorded or sent anywhere.
The big letter is the note closest to what you are playing. The needle shows how far off it is in cents, a hundredth of a semitone: left means flat, tune up; right means sharp, tune down. Within ±5 cents it turns green — the margin a trained ear can no longer hear on a sustained note.
Pick your instrument and the tuner also recognises which string you are playing and highlights it, and you can tap each string to hear its reference note.
A chromatic tuner recognises all twelve notes of the scale, not just an instrument’s open strings. It works for anything that plays a note: guitar, bass, ukulele, violin, winds, voice or a piano you want to check. Detection uses the McLeod pitch method, the same as the Sound Tools app, which avoids the classic mistake of simple tuners: reading the note an octave off on instruments rich in harmonics.
The default reference is A = 440 Hz, the international standard. Many European orchestras tune to 442 and early-music groups to 415: change the “A =” field and every note is recalculated.
The same tuner on iPhone, Apple Watch and Android, offline, with an instrument catalogue and every string turning green within ±5 cents. Plus a metronome, a spectrum analyzer and a chord and key detector. Free, no account.
Get it on Google Play Download on the App StoreOpen this page, tap “Turn on microphone”, allow access and play an open string near the phone. The note appears in large type and the needle shows whether to tune up or down. It works in Chrome, Safari, Firefox and Edge, on Android, iPhone and desktop.
No. The analysis runs in your browser and the sound never leaves your device: the page neither records it nor sends it to any server.
It shows the offset to the cent and calls a note in tune within ±5 cents. Real-world accuracy depends mostly on the microphone and room noise; in a quiet room it is plenty to tune any instrument.
Anything that plays a note, because it is chromatic. It also has ready-made tunings for guitar (including Drop D, DADGAD, Open G and more), 4-, 5- and 6-string bass, ukulele, violin, viola, cello, double bass, mandolin, banjo, charango, requinto and bouzouki.
Yes: Sound Tools for iPhone, Apple Watch and Android does the same offline and without an account, and adds a metronome, a spectrum analyzer and a chord and key detector. It is free.