432 Hz checker: is that song really 432?
Most "432 Hz" uploads were never measured by anyone — including the platform they're on. This checker listens to the actual notes and tells you the real tuning in about 30 seconds. Press start and play the song.
Checking a YouTube video? Pick "Browser tab audio." Spotify or Apple Music? Pick "Screen/Desktop audio." Music playing in the room works too — just use the microphone.
The checker samples the notes it hears and compares them against tuning tables. Melodic, sustained passages give the fastest, most confident reading.
A true 432 Hz track reads ~432 on the A4 reference. If it reads ~440, the label was wrong — no matter what the title says.
Most "432 Hz" uploads aren't 432.
Platforms don't verify tuning claims — anyone can type "432 Hz" into a title. Pitch-shifted rips, copied descriptions, and re-uploads of re-uploads mean the label and the audio often disagree. Here's why it happens so often.
Make it actually 432 Hz.
If a song fails the check, retune your own copy: the HZ Detect desktop app measures each song first, then converts it from its measured tuning to exactly 432 Hz — your whole library if you want. See the 432 Hz converter →
432 Hz checker — common questions
Is this 432 Hz checker free?
Yes. The checker runs right on this page, unlimited, no account. Everything is analyzed on your device — your audio is never uploaded.
How accurate is the check?
The detector samples the actual notes in the music and matches them against tuning tables for 440 Hz, 432 Hz, and the Solfeggio frequencies, reporting the A4 reference it measures. For the cleanest reading, use tab or desktop audio capture instead of the microphone, and let it listen through a melodic section of the song.
Can I check songs on YouTube or Spotify?
Yes. Choose "Browser tab audio" to check a YouTube tab, or "Screen/Desktop audio" to check Spotify, Apple Music, or any other app playing on your computer. You can also just play the song near your microphone.
The checker says 440 Hz — now what?
Then the upload isn't really 432 Hz, which is very common. The only guaranteed way to listen at 432 Hz is to retune your own copy: the HZ Detect desktop app converts songs from their measured tuning to exactly 432 Hz.
What does 432 Hz actually mean?
It's a reference pitch: music "in 432" has its A4 note tuned to 432 Hz instead of the modern 440 Hz standard — about 32 cents lower. The checker measures which reference the music actually follows.
Wondering about a song's frequency in general? Find out what Hz any song is →