Online vocal pitch monitor: see the note you sing in real time
This vocal pitch monitor listens through your microphone and instantly shows the note you're singing, how many cents you're off, and your voice's path over a piano keyboard. It works in the browser on your phone or computer, with nothing to install.
How to use the pitch monitor
- Tap Start microphone and allow access when your browser asks.
- Sing a comfortable vowel, like "ah" or "oh", and hold the note.
- At the top you'll see the note name (C4 is middle C) and how far off you are in cents: green within 10 cents, orange up to 25, and red beyond that.
- The line moving across the keyboard shows the last few seconds of your voice, so you can see if you go flat at the end of a note or drift sharp.
- Tap any key to hear it and compare it with what you sing.
Use the range selector (low, mid, high or wide) to choose which part of the keyboard is shown, to fit your voice.
What cents are, and how close is "in tune"
Two neighboring piano keys are a semitone apart, and every semitone is split into 100 cents. That's why a pitch monitor tells you not just the note, but how close you are to its center.
Voices aren't judged like instruments. In perception studies, listeners accept a sung note as in tune even when it's off by around 50–60 cents, while they notice much smaller errors on a violin. And untrained adults miss by about 30 cents on average when matching a note. So don't chase zero: staying in green and orange already sounds in tune; red is what you want to fix.
Why practice with a pitch monitor
- Find out if you sing in tune. Many people honestly don't know; the monitor shows you in seconds.
- Hold steady notes. See whether a note wobbles, sags or rises at the end of a phrase.
- Explore your range. Slide from low to high and notice where you start to strain.
- Find your starting note before you sing or record a song.
Research on voice training keeps pointing to the same thing: what improves pitch accuracy is singing and getting immediate feedback, not just listening. Seeing your voice in real time is exactly that feedback.
When to move on to guided exercises
The pitch monitor is open-ended: you choose what to sing. When you want specific goals, try the pitch matching exercises, where you hear a note and have to hit it and hold it, or interval ear training.
Frequently asked questions
Is my voice recorded?
No. The microphone audio is analyzed inside your browser to detect the note, and it is never recorded or sent to any server.
Does it work on my phone?
Yes, on Android and iPhone, right in the browser. Find a quiet spot and don't cover the phone's microphone.
What does C4 mean?
c4nta uses scientific pitch notation: the letter is the note and the number is the octave. C4 is middle C on the piano, and A4 is the 440 Hz A.
Is it free?
Yes, and you don't need an account. The free version includes some practice time every day; if you want unlimited practice you can upgrade to c4nta Pro.
More c4nta exercises
- Vocal warm-up — a guided routine to warm up your voice before singing or recording.
- Pitch matching exercises — hear a note, sing it and hold it inside the target band.
- Interval ear training — hear two notes and sing them, from a minor second to an octave.
- Scale degree ear training — hear a note in a key and guess which scale degree it is.
- Melodic dictation — hear a short melody and play it back note by note.
- Karaoke pitch trainer — sing a melody with a piano guide and get a pitch accuracy score.