What Hz is this song?
Play it and find out. The detector below listens to the notes and measures the tuning the song actually follows — 440, 432, 444, or any Solfeggio frequency — in about 30 seconds.
A song's "Hz" is its reference tuning.
Music contains thousands of frequencies — one per note. What people mean by "what Hz is this song" is the A4 reference: the pitch the whole tuning system hangs on. Standard music sits at A4 = 440 Hz; alternatives like 432 Hz shift every note together, about 32 cents lower. More on what frequency means in music.
The mobile app names the song, too.
Point your phone at whatever is playing: the free HZ Detect app for iOS & Android identifies the track and measures its tuning in one listen — then links you to a retuned version.
The desktop app measures every song in your library at once — free — and labels each with its real tuning.
Finding a song's Hz — common questions
What does the Hz of a song mean?
Every note has its own frequency, so a song contains thousands of frequencies. When people ask what Hz a song is, they usually mean its reference tuning: the frequency its A4 note is tuned to. 440 Hz is the modern standard; 432 Hz and the Solfeggio frequencies are the common alternatives.
How do I find a song's Hz?
Press start on the detector above and play the song — through your mic, a browser tab, or desktop audio. It samples the notes it hears, matches them against tuning tables, and reports the A4 reference in about 30 seconds.
Can it identify the song too?
On this page it measures tuning only. The free HZ Detect mobile app for iOS and Android does both at once: it names the song that's playing and measures its tuning, then links you to a retuned version.
Why does a '432 Hz' video read 440?
Because uploads are labeled by uploaders, not measured by platforms. Mislabeling is extremely common — the reading reflects the audio, not the title.
Is my audio uploaded when I check it?
No. The analysis runs entirely in your browser, on your device. Nothing you play is recorded or sent anywhere.
Specifically checking for 432? Use the 432 Hz checker — or convert your music to 432 Hz for a guaranteed result.