Free · ten rounds · about two minutes
432 vs 440 test
Can you hear whether music is tuned to 432 or to 440 Hz? Ten rounds, a single A and then a short melody, each at one of the two at random. You say which. Only at the end you see the score, every round, and how often a coin would have done as well.
Mika knows the ambulance's note by heart. Whether you know 432 from 440, ten rounds will say.
Headphones or a good speaker help; a phone speaker works too. No microphone.
432 or 440?
Your score
–/10
The count started on 30 October 2026. At the end the page sends your score, a number from 0 to 10, and nothing else; once enough people have taken the test, this line will say how many of them could tell.
What the test plays
Each round is tuned to A = 432 or A = 440 Hz, decided by a coin toss when you start. Rounds one to five play the A above middle C alone for two seconds on a synth pluck; rounds six to ten a phrase of eight notes in A minor on a sampled guitar. The two tunings are 31.8 cents apart, a little under a third of a semitone: 440 is 1.85 % higher. Nothing tells you which one is coming, and you see no right or wrong until all ten are done, so a lucky streak can't steer you.
What your score means
Guessing, you get five of ten on average, and a coin lands on seven or more about 17 times in 100. Nine or ten happens to a coin about once in a hundred tries, so a score like that is your ear, not luck. Most people can hear 432 and 440 apart when the two play one after the other: a step of a third of a semitone is far above the few cents a trained ear notices. Here there is no direct comparison. You judge each round against your memory of the last ones, which is a much harder task, close to what people with absolute pitch do.
What it does not test
Whether 432 sounds better, calmer or healthier. Telling two tunings apart says nothing about which one is nicer, and this page claims nothing for either. Where the number 432 comes from, Verdi, middle C at 256 and the Schumann resonance that doesn't fit, is on the 432 Hz tuner page. To hear your own music at 432, the 432 Hz converter retunes a song file in the browser.
The count
When you finish, the page sends your score to the server, the same way it counts a page view: a number from 0 to 10, nothing about your sound, your device or you. Once enough people have played, the line under the score will say how many could tell. For a test of absolute pitch on single notes, try the perfect pitch test.
Audio: tones your browser makes on this page; no microphone. Nothing about the audio reaches the visit count.
Facts checked on .