Pitch Detector
Check a recording or sing live. See exactly where you go sharp or flat.
Works best when you sing on your own, or with the backing in headphones. Your recording never leaves your device.
How to use the pitch detector
- Add a recording, or sing live. Drop in a phone voice memo, an mp3, a WAV or a video of yourself singing. To see your pitch as you sing, choose “Sing into your microphone”.
- It finds the notes you held. The detector follows your voice through the whole take and picks out each note you held for a moment.
- See what to fix. It shows which notes went sharp (too high) or flat (too low), by how much, and when. Click a time to hear that moment again.
Below the results, a line traces your pitch through the whole recording. In-tune notes are green, off notes are amber. Click anywhere on the line to listen from there.
How it decides a note is off-key
It only judges notes you hold. Anything shorter than about a third of a second, like a quick run or a slide into a note, is left alone. Those are part of singing, not mistakes. Vibrato is fine too. It looks at the center of the wobble, not each swing.
Small slips don’t count. A note is flagged only when it’s more than a quarter of the way to the next key on a piano (25 cents).
It catches notes that drift. Some long notes start in tune, then sink or creep up as you hold them, often when you’re running out of breath. It flags those too.
It shows what matters most. You get at most three things to work on. If the same note goes sharp three times, that’s one item, and all three moments are listed.
It won’t blame you for an out-of-tune backing. If you sang along to an old record or an out-of-tune guitar, the whole song may sit higher or lower than standard pitch. The detector notices this and measures your notes against the song, so it won’t mark every note wrong.
How to get an accurate result
Record just your voice: sing on your own, or listen to the backing track through headphones while you record. Your phone is good enough. A voice memo made in a quiet room works well.
Questions
Is it free? Do I need an account?
Yes, it’s free. No account, no sign-up, no daily limit.
Is my recording uploaded anywhere?
No. The pitch detector runs in your browser, so your recording never leaves your device. The live mic isn’t recorded or saved either.
Can I check a song with music playing behind me?
It works best on your voice alone. Quiet music behind a clear voice can still work. Loud music can throw it off, especially an instrument playing the same notes you sing, because the detector can’t always tell which sound is you.
What does “cents” mean?
A cent is a tiny step in pitch. Two neighboring keys on a piano are 100 cents apart. So “30 cents flat” means your note landed almost a third of the way down to the key below. The detector flags anything more than 25 cents off.
Why does it say “Not enough held notes to judge”?
It needs at least three notes you held steady to give a fair result. Talking, fast runs, or loud music over your voice can leave too few. Try a slower part of the song where you hold some notes.
Should I use a recording or the live mic?
Use a recording to check a whole song. You’ll see every problem spot and can play each one back. Use the live mic to find the note you’re singing or humming right now, and whether you’re on it. It’s handy for warm-ups, or for working on one note until it’s in tune.
Does it work for guitar or piano?
It’s made for the voice. To find the notes in an instrument recording, open it in our spectrum analyzer. Point at any line in the picture and it tells you the note.