Free online chromatic tuner for any instrument
What a chromatic tuner is, how to use a free online tuner with your phone mic, and why cents matter. Open practice cents — no install.
Open tunerWhat is a chromatic tuner?
A chromatic tuner listens to pitch across all twelve notes in an octave — not only open strings. That makes it useful for guitar, band, orchestra, and voice: play any note, see how far you are from in-tune in cents (1/100 of a semitone).
Browser tuners use your device microphone and Web Audio. On iPhone, use Safari and allow mic access; Add to Home Screen keeps the app fullscreen for rehearsal.
How to use an online tuner well
Quiet the room, hold the phone near the instrument, and play a steady tone. Watch the needle or cents readout settle — don’t chase every flicker. For winds and strings, tune at performance volume when you can; soft pitches can read flat on cheap mics.
- Allow microphone permission when prompted
- Aim for near 0¢ on the target note
- Use transposition if you play Bb, Eb, or F instruments
- Cross-check with a drone or piano when learning intonation
On practice cents
Chromatic tuner with band transposition, plus metronome, recorder, journal, and HYKOM in the same app. No account required to tune.
FAQ
- Is there a free online chromatic tuner for phone?
- Yes. practice cents includes a free online chromatic tuner that uses your phone microphone in the browser — no app store install required. Add to Home Screen for a fullscreen PWA.
- What are cents on a tuner?
- A cent is 1/100 of a semitone. 0¢ means in tune with the target pitch; positive is sharp, negative is flat. Chromatic tuners show how many cents you are from the nearest note.