Viola tuner
Pluck a string — the tuner recognises it and shows whether to tighten or loosen it. It works with your microphone right in the browser; the sound is never uploaded.
Microphone needed
Sound is analysed right in your browser and never uploaded. The browser will ask for permission once.
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turn on the microphone
Auto: the string is detected automatically. Tap a string to hear its note — the tuner will then listen only to it.
A reference: 440 Hz
Viola tuning
The viola is tuned in fifths C G D A — a fifth below the violin. Tune from the A string, just like on a violin.
- 4th string — C3, 130.81 Hz
- 3rd string — G3, 196 Hz
- 2nd string — D4, 293.66 Hz
- 1st string — A4, 440 Hz
How to tune a viola online
- Press "Turn on microphone" and allow access — the sound is processed right in your browser and never uploaded.
- Pluck one string. The tuner recognises it and the needle shows how far it is below or above the note.
- Needle left of centre — the string is flat, tighten the peg. Right — it is sharp, loosen it. The green zone (±5 cents) and a check mark mean the string is in tune.
- Prefer tuning by ear? Tap a string in the list to hear its note.
- Start with A, then D, G and C.
- The low C sounds deep — bow it evenly and let it open up.
Frequently asked questions
How is a viola tuned?
C G D A: C 130.81 Hz, G 196 Hz, D 293.66 Hz, A 440 Hz.
How is viola tuning different from violin?
The viola has no high E but adds a low C: the whole tuning is a fifth lower.