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Pitch Trainer: Sing in Tune With Live Pitch Feedback
Sing a note and watch your live pitch line drawn against the target note, with your error shown in cents and one named hint per mistake. A range finder places every exercise inside your own comfortable voice range.
Pitch Trainer is a free web app that teaches you to sing in tune. A hand-written autocorrelation detector, with no model download and no network use, measures your pitch from 65 to 1050 Hz (about C2 to C6) and draws your live pitch curve against the target note, with the error in cents. The exercises: 8 single notes, 9 intervals from a major second to an octave (up and down), and the opening phrases of 6 traditional public-domain melodies, including Hot Cross Buns, Mary Had a Little Lamb, and Twinkle Twinkle. A range finder puts every exercise inside your own comfortable range. Named hints tell you what to fix: sing higher or lower, slide up or down into the note, an octave up or down, or hold it steady. The app itself speaks your language: English, French, Spanish, and Japanese, switchable inside the app. Everything runs on your device: no audio is recorded, uploaded, or sent anywhere. It is a home practice tool, not a voice teacher.
Open Pitch Trainer
How the pitch detector works
Pitch Trainer uses normalised autocorrelation on the raw microphone signal: a few kilobytes of plain, explainable code, not a neural network. It finds the period of your voice and reads the pitch, with parabolic interpolation for sub-sample accuracy. The range covers 65 to 1050 Hz, from low bass to high soprano. Silence and breath noise return nothing rather than a guess, and the detector is octave-aware: a pure tone correlates at twice its period too, so the code prefers the shortest matching lag instead of misreading 440 Hz as 220 Hz. Your error is shown in cents, where 100 cents is one semitone, so you can see exactly how far sharp or flat you are.
Singles, intervals and melodies
Exercises are written in semitones from a tonic, then placed inside your range by the range finder, so levels feel like one key that fits your voice:
- 8 single notes: scale degrees from the tonic up to the octave, the foundation of in-tune singing.
- 9 intervals: major second, minor and major third, perfect fourth and fifth, major sixth, and octave, plus descending major third and fifth. Each is scored on both notes and the leap between them.
- 6 traditional melodies: the opening phrases of Hot Cross Buns, Mary Had a Little Lamb, Au clair de la lune, Frère Jacques, London Bridge, and Twinkle Twinkle, all public domain.
Intervals unlock at 50 points and melodies at 150, so you earn the harder music with steadier pitch.
Named hints, never just a score
Every miss maps to one plain-language hint: sing a little higher or lower, much higher or lower when you are more than a semitone off, slide up or down into the note when you start off target, an octave up or down when you are in the wrong octave entirely, or hold it steady when your pitch wobbles. A note only passes when you hold it close to the target for the full required time. Wrong versions are rejected outright, and the built-in unit tests prove every rule with synthetic tones, including the wrong versions that must fail.
Levels, badges, and four languages
Points unlock five levels, and badges mark the milestones: your first sung note, finding your range, finishing all the single notes, finishing all the intervals, your first melody, a bullseye take, a perfect round, and a 7-day practice streak. Confetti and chimes celebrate wins, and you can switch them off. The whole app interface is translated in-app: English, French, Spanish, and Japanese, switchable any time from the menu, with note names in each language's own system (Do Re Mi, orドレミ).
Your audio never leaves your device
Microphone audio is measured and immediately discarded. Nothing is recorded, uploaded, or shared. The page security policy blocks connections to every outside server, and the built-in Offline proof panel shows a live log of every network request the page makes, lets you simulate a fully offline session, shows exactly what is stored on your device, and deletes it all with one button. The app works offline after your first visit. The microphone runs only while you are on a singing screen.
Start singing
Training something else? Rhythm Tutor coaches clapping in time, Tone Trainer coaches Mandarin tones, and Sound Alerts teaches you to see everyday sounds, all the same private, on-device way.
This is a home practice tool, not a teacher, therapist or safety device. Everything runs on your device: no video, audio or images are sent anywhere. Feedback is automatic and can be wrong. For real instruction, learn from a qualified singing teacher, linked on the Resources page.
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Frequently asked questions
What is Pitch Trainer?
A free web app that teaches you to sing in tune. It measures your pitch from the microphone with a hand-written autocorrelation detector, draws your live pitch line against the target note with the error in cents, and gives one named hint per mistake. Exercises: 8 single notes, 9 intervals, and 6 traditional melodies. Everything runs on your device. It is a home practice tool, not a voice teacher.
How does it detect my pitch?
Normalised autocorrelation on the raw microphone signal: the code finds the repeating period of your voice and reads the pitch, with parabolic interpolation for sub-sample accuracy. It is a few kilobytes of plain code, not a neural network, so there is no model download and no network use.
What exercises are included?
8 single notes (scale degrees up to the octave), 9 intervals (major second, minor and major third, perfect fourth and fifth, major sixth, octave, plus descending major third and fifth), and the opening phrases of 6 traditional public-domain melodies: Hot Cross Buns, Mary Had a Little Lamb, Au clair de la lune, Frère Jacques, London Bridge, and Twinkle Twinkle.
What is the range finder?
The range finder listens to your voice and maps your comfortable singing range. Every exercise is then placed inside that range, so a bass and a soprano each get the same exercises at a pitch that fits their voice.
What do the hints mean?
Each miss gets one plain-language hint: sing higher or lower, much higher or lower (more than a semitone off), slide up or down into the note, an octave up or down (wrong octave), or hold it steady (pitch wobbling). A note passes only when you hold it close to the target for the full required time.
Which languages does the app support?
Four, switchable any time inside the app: English, French, Spanish, and Japanese. Note names follow each language's own system, such as Do Re Mi orドレミ.
Does it work offline?
Yes, after your first visit. The app and the detector are saved on your device, so everything works with no network. The Offline proof panel even lets you simulate a fully offline session.
Is my singing recorded or uploaded?
No. Microphone audio is measured on your device and immediately discarded. Nothing is recorded, uploaded, or shared. The page security policy blocks connections to every outside server.
Can I delete my data?
Yes. Open Offline proof on the home page and press Delete all my data, or clear progress from the dashboard. Everything is stored only in your browser, on your device.
How do I know if I am in tune?
Your error is shown in cents, where 100 cents is one semitone. Small numbers mean you are close; the target is to hold the note within the passing tolerance for the full required time. The live pitch line shows the curve of your voice against the straight target line.
Is this a substitute for a singing teacher?
No. It is a home practice tool, not a teacher, therapist, or safety device. Feedback is automatic and can be wrong. For real instruction, learn from a qualified singing teacher, linked on the app's Resources page.
Who is it for?
Anyone who wants to sing more in tune: beginners finding their voice, choir members, karaoke fans, or instrumentalists training their ear. The range finder adapts every exercise to low and high voices.