Free Online Pitch Detector: See the Note You’re Singing in Real Time

Most pitch detector apps ask you to install something, create an account, or squint at a tuner built for a guitar. HumMatch's free online pitch detector is none of that: open the page, allow your microphone, and sing or hum. The note you're hitting shows up instantly, right there in your browser.

No download. No sign-up. Nothing you sing is recorded or uploaded anywhere. It runs entirely on your device, which is also why it's free: it's the front door to the rest of HumMatch, not a product on its own.

What you actually see on screen

Three things update in real time as you sing or hum: the note name and octave (for example A3 or C#4), a cents meter that shows how many cents sharp or flat you are from the center of that note, and a live pitch trace that draws your pitch as a line, so you can watch it hold steady, slide, or wobble with vibrato.

Under the hood, the detector reads your microphone roughly 45 times a second using a McLeod/YIN-family pitch algorithm, with a clarity gate that ignores background noise and breath sounds so it isn't guessing from silence. For a clean, sustained tone it resolves well under a semitone, which is exactly why it can show you cents instead of just a note name.

How to get a clean reading

A steady "ahh" works, but a closed-lips hum often reads even more cleanly, because there are no consonants interrupting the pitch. Hold one note for a couple of seconds and watch the trace settle instead of jumping around. If the readout flickers, that's usually your voice moving, not the detector guessing: real voices wobble more than we notice until we watch a line trace it.

What singers actually use it for

Checking intonation on a sustained note before a performance, practicing a slow slide between two pitches, warming up with sirens while watching the line sweep, finding a starting note for a song, or just settling the question of whether that last note was actually in tune. If you only want the note name without the cents meter and trace, HumMatch also has a simpler note finder built for exactly that question: what note am I singing?

One note is a reading. Your range is the plan.

A pitch detector tells you what you're singing right now, one note at a time. It doesn't tell you what your voice can do across its whole range, or which of the 40,000+ songs in HumMatch's catalog actually fit you. That's what the free vocal range test is for: three guided hums, about 30 seconds, and you get your exact lowest and highest note, your voice type, and a ranked list of songs built for your voice specifically.