Free Online Chromatic Tuner
A fast, accurate chromatic tuner that runs entirely in your browser. Allow microphone access and play a note — it detects the pitch in real time and shows how many cents you are sharp or flat. No app to install, no account, and it keeps working offline once loaded.
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♭ -500+50 ♯
Reference pitch
A = 440 Hz
415 Hz — 446 Hz
Features
- Chromatic pitch detection — tune guitar, bass, violin, ukulele, brass, woodwinds and voice.
- A = 440 Hz concert reference with a clear cents-deviation readout.
- Runs on-device in the browser — your audio never leaves your computer.
- Free, no sign-up, and installable as an offline app.
Frequently asked questions
- Is this tuner really free?
- Yes. Every tool on Atomic Practice is free to use with no account and no ads.
- What instruments can I tune?
- It is a chromatic tuner, so it works for any instrument — guitar, bass, violin, cello, ukulele, brass, woodwinds, and voice.
- Does it work offline?
- Yes. After your first visit the tuner is cached and works without an internet connection.