Chromatic tuner
Tune any instrument: the needle shows the nearest note and how many cents sharp or flat you are. Choose an instrument preset to snap to its strings and get reference tones.
How the tuner hears pitch
The tuner reads about 0.1 seconds of sound from your microphone at a time and runs the YIN algorithm (de Cheveigné and Kawahara, 2002), which compares the waveform with delayed copies of itself to find the period that repeats. That period gives the fundamental frequency. The frequency converts to a note on the equal-tempered scale: each semitone is a factor of 21/12 ≈ 1.0595, so the distance from the nearest note comes out in cents.
For a live pitch graph of your voice, use the pitch detector. For guitar-specific tunings, see the guitar tuner.
Questions
What is a chromatic tuner?
A tuner that recognises all 12 notes of the chromatic scale, not just the open strings of one instrument. It works for any instrument or voice: violin, cello, mandolin, banjo, wind instruments, or singing.
Can I tune a violin, viola or cello here?
Yes. Pick the instrument from the menu (violin G D A E, viola and cello C G D A) to snap to its strings and hear reference tones, or switch on chromatic mode for any note.
What is A4 = 432 Hz vs 440 Hz?
A4 = 440 Hz is the international standard concert pitch (ISO 16). Some orchestras tune slightly higher (442–443 Hz), and some musicians prefer 432 Hz. Set the reference to whatever the group you play with uses.
What does “cents” mean on a tuner?
A cent is 1/100 of a semitone. ±5 cents is close enough for most listeners; beyond about ±10 cents the note starts to sound out of tune against other instruments.