Free Online Violin Tuner
Play an open string — see exactly how in tune you are.
Allow microphone access to begin
How to use this tuner
Click Start Tuning and allow microphone access. Play a string — the tuner detects pitch in real time and shows how sharp or flat you are in cents.
The bar spans −50 to +50 cents. Zero is perfectly in tune. The history line shows where you’ve been — for bowed strings, this reveals whether pitch drifts as bow pressure changes mid-note.
Violin is set by default. Use the dropdown to switch to another instrument if needed — note names automatically adjust.
Default is A440. Tap + / − to match your ensemble — A441–442 is common in orchestras, A415 for historical pitch.
Violin intonation is entirely in your hands — no frets to fall back on. Open strings (G3, D4, A4, E5) give you four fixed reference points, but everything in between depends on finger placement, bow speed, and contact point. Bow pressure is one of the biggest pitch variables: too much weight and the string goes sharp; too little and it drops flat. The pitch history display reveals these patterns across a sustained note — not just where you start, but whether pitch drifts as bow pressure changes or your arm grows tired. If you consistently start sharp and settle flat, or see a sag in the middle of long notes, you now have objective data to work with. Tune open strings with the bow, not pizzicato — the bow introduces the same variables you’ll face while playing.
Want the complete experience?
The Tunable app adds 15+ tuning temperaments, metronome, tone generator, recording, ear training, and more — all on your phone.
