Extension
Detect frequency while you listen.
The hzdetect browser extension measures tuning in real time while music plays. It can listen to tabs or desktop audio from apps like Spotify, Apple Music, Pandora, and more, plus any mic input.
Supported browsers
Chrome, Brave, Edge, and Firefox.
Why it matters
Streaming labels are unreliable
Uploads may be mislabeled. Detect first, then retune your own music for guaranteed accuracy.
Most "432 Hz" uploads may be mislabeled - retune your own music for guaranteed accuracy.
Platforms do not validate tuning claims. Detect the real frequency, then retune your own files to lock in the tuning you want.
Retune with confidence Detected 440 Hz? Retune now
Move from detection to guaranteed results by retuning your own music.
Retune now