Online Tuner
Play a clean reference tone for any string or note and tune your instrument by ear. No microphone needed.
Tap a string to sound its reference pitch continuously; tap again to stop. Match your instrument to the tone, then move to the next string.
Free online reference-tone tuner
The Ajenza Online Tuner plays a clean, accurate reference pitch so you can tune your instrument by ear — no microphone and no permission required. Choose a preset for guitar, bass, violin or ukulele and each string appears as a button, or switch to chromatic mode for any note and octave. Every tone is generated live with the Web Audio API, and you can adjust the A4 calibration from 415 to 466 Hz (default 440 Hz) for period or ensemble tuning. Sound the pitch, match your string to it, and move on.
Is it free?
Yes — completely free, with no sign-up, download or watermark.
Does it listen through my mic?
No. It plays a reference tone to tune by ear; no microphone or permission is used.
Can I change A4?
Yes — the A4 slider sets the reference from 415 to 466 Hz; the default is 440 Hz.
Do I need to install anything?
No. Everything is generated live in your browser with the Web Audio API.
More free music tools: Online Piano · Online Instruments · Metronome