Free online tuner

No. Your browser hands the microphone signal to code running on your own machine, which measures how often the waveform repeats and turns that into a pitch. Nothing is recorded, nothing is stored, and no audio is sent to us or to anyone else.

We also switch off echo cancellation, noise suppression, and automatic gain — not for privacy, but because all three are designed to make speech clearer and they distort the pitch information a tuner depends on.

A cent is one hundredth of a semitone. −10 cents means you're slightly flat and should tune up; +10 cents means you're sharp and should come down.

Most people can't reliably hear a difference under about five cents, which is why anything inside that window is treated as in tune here. Chasing a perfect zero is usually wasted effort — the note will drift as the string settles anyway.

A4 is the reference every other note is measured against. 440 Hz is the modern standard, but plenty of European orchestras tune to 442 or 443 to brighten the sound, and period ensembles often play at 415 — roughly a semitone lower.

If you're playing with other people, the only correct answer is whatever they're using. Being perfectly in tune with yourself and wrong with everyone else is the worst of both worlds.

Almost always background noise, or a note that has already decayed too far to read. Pluck firmly, let the note ring, and read it in the first second or two while there's still energy in it. A quiet room helps more than anything else.

Very low notes are the hardest case — a bass low E is around 41 Hz, and many laptop microphones simply don't capture that well. If you're fighting your mic, that's the honest limit of a browser tuner, not a flaw in your playing.

Yes. No sign-up, no account, no ads, and no trial that quietly turns into a subscription. The same tuner is built into the RhythmRamp app alongside everything else, for a one-time $4.99 — but this one costs nothing and always will.