# Pitch Trainer: Sing in Tune With Live Pitch Feedback > Pitch Trainer is a free web app that teaches you to sing in tune: a live pitch line against the target note with feedback in cents, 8 single notes, 9 intervals, 6 traditional melodies, and one named hint per mistake. On-device only, no account, not a voice teacher. *Interactive tool: enter your values at https://toollantern.win/learn-singing-pitch/ and results update instantly in your browser.* ## 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. --- Interactive version: https://toollantern.win/learn-singing-pitch/