Chromatic tuner. Free. In your browser.
Tap start to begin
Like the meter? The Mac app uses the same YIN engine — but reads your USB interface at full sample rate, runs sub-50 ms via Core Audio, lives in your menu bar, and adds 15 instrument presets, 8 historical temperaments, and capo.
Get the Mac app — $6.99Free vs native
When the browser hits its ceiling.
The free tuner above runs entirely in your browser. That makes it instantly accessible — but the web platform caps how far it can go. The native macOS app removes those ceilings.
| Feature | Free · Browser | Native · macOS |
|---|---|---|
| Pitch detection | YIN, ±1¢ accuracy | YIN, ±0.14¢ on pure tones, ±1¢ real-world |
| Latency | 12–60 ms WebAudio jitter | Sub-50 ms perceived (Core Audio) |
| Audio input | Built-in microphone only | Built-in mic + any USB interface or Aggregate Device |
| Tunings | Chromatic | Chromatic + 15 instrument presets (guitar, bass, bowed, folk) |
| Display | LED meter | LED meter + Peterson-style rotating strobe |
| Temperaments | Equal temperament, A4 = 440 Hz | 8 historical temperaments, A4 = 349–500 Hz, capo, ±11-semitone transpose |
| Lives in | A browser tab | Your menu bar — always one click away |
| Offline | Cached page only | Fully offline — zero network calls |
| Price | Free forever | ${price} once, lifetime 1.x updates |
Tune in the browser when you're away from your Mac. For serious work — recording through an interface, fine intonation, stage use — the native app is $6.99 once.
Get the Mac app — $6.99How to use it
Three steps to in-tune.
Tune any pitched instrument directly in your browser. No install, no account, no audio leaves your device.
- 01
Allow microphone access
When your browser shows the permission dialog, click Allow. The tuner reads from your default input — built-in mic or whatever audio interface the browser sees.
- 02
Play or sing a note
Strum a string, hit a key, sing a vowel. The tuner picks up any pitched sound and locks onto the closest note in real time.
- 03
Watch the LED needle
The bar shows how far you are from the closest note. Green at ±5 cents means you're in tune — adjust until the needle settles green for a beat.
FAQ
Questions about online tuning.
Quick answers about accuracy, mobile support, and what's different between the browser version and the Mac app.
How accurate is this online tuner?
±1 cent in real-world use, ±0.14 cent on pure tones. Pitch detection uses the YIN time-domain algorithm with a 4096-sample window and octave-error correction for plucked strings — the same algorithm and tuning parameters as our macOS app, just running in JavaScript instead of Swift.Does it work on iPhone, iPad, or Android?
Yes — any modern browser with WebAudio and getUserMedia support. iOS Safari needs one tap to start the mic (Apple's policy). Android Chrome works on auto-start once you've granted permission. The LED meter is responsive down to 375 px wide.Can I tune a guitar, bass, ukulele, or violin with it?
Yes. The tuner is chromatic — it locks onto the closest note regardless of instrument. Guitar, bass, ukulele, mandolin, violin, viola, cello, double bass, banjo, brass, woodwind, voice — anything with a clear pitch in the human-audible range works.Is my microphone audio sent anywhere?
No. Audio is processed entirely inside your browser. The microphone stream stays on your device — nothing is recorded, uploaded, or shared with us or any third party. Once the page itself has loaded, the tuner makes zero outbound network calls.Why is the Mac app faster than the browser version?
WebAudio adds 12–60 ms of jitter on top of mic-to-screen latency, and the browser can throttle audio processing when the tab loses focus. The native macOS app reads your interface directly via Core Audio at full sample rate, with sub-50 ms total perceived latency and no throttling.Does it support alternate tunings like Drop D or DADGAD?
The online version is chromatic only — it always shows the closest note. The macOS app ships 15 instrument presets (Drop D, DADGAD, Open G, half-step down, 7-string guitar, bass, bowed strings, ukulele, mandolin, banjo) plus capo, custom A4, ±11-semitone transpose, and eight historical temperaments.
Like the meter? The Mac app uses the same YIN engine — but reads your USB interface at full sample rate, runs sub-50 ms via Core Audio, lives in your menu bar, and adds 15 instrument presets, 8 historical temperaments, and capo.
Get the Mac app — $6.99