LESS FUSS. MORE MUSIC.
Viola Tuner
Tune the open strings of your viola to C G D A, with a clear note, octave, and cents readout.
READY WHEN YOU ARE
Hz play a single note
Your next good note starts here.
Start the microphone, then play a single note.
Just you and your instrument. Audio stays on your device.
Pick your instrument
Use a preset or go chromatic.
Tap a note to tune a specific string.
Let it listen
Allow microphone access.
Play one clear note at a time.
Meet in the middle
Adjust until the marker turns green.
Flat? Tighten. Sharp? Loosen.
Viola tuning notes
Standard viola tuning is C3, G3, D4, A4, from the lowest string to the highest. It shares G, D, and A with the violin and adds a lower C string.
| Target | Note | Frequency |
|---|---|---|
| 1 | C3 | 130.81 Hz |
| 2 | G3 | 196.00 Hz |
| 3 | D4 | 293.66 Hz |
| 4 | A4 | 440.00 Hz |
Targets are listed in preset order. Frequencies above use A4 = 440 Hz; changing Reference A4 adjusts the live tuner targets.
How to tune your viola
Play a sustained open string while keeping the other strings quiet. Check A first against your ensemble reference, then tune D, G, and C. Use small fine-tuner adjustments as you approach the center.
Which octave should each viola string use?
The C and G strings are in octave 3; D and A are in octave 4. Check the octave beside the detected note so you do not mistake a harmonic for the open string.
What do flat, sharp, and cents mean?
Flat means your pitch is below the target; sharp means it is above it. A cent is one hundredth of a semitone. Move toward 0 cents using small adjustments. For strings, tighten to raise pitch and loosen to lower it.
Can I change the reference pitch?
Reference A4 defaults to 440 Hz and accepts 400–480 Hz. Match your ensemble’s reference before tuning. The selected preset keeps its note names while its target frequencies adjust.
Choose your instrument tuner
Open a dedicated tuner for your instrument, or share its link for your next practice session.