Voice to notes: see what you sing

While you sing, the big display shows the note you're on with its octave number (middle C is C4), the frequency in hertz and how many cents you are off: 100 cents make a half step, and the needle turns green when you're within 10 cents of the note. A scrolling pitch curve shows the last 8 seconds against a grid of notes, so you can see slides, vibrato and wobbly long notes.

Pitch is detected with the McLeod method, which works well for a single voice, whistling, a recorder, flute or violin. Chords, backing tracks and noisy rooms confuse it, so sing alone, close to the microphone, in a quiet room.

When you stop, the tool turns the pitch curve into separate notes and shows them on the curve and in a table: note name, solfège syllable, length and how many cents sharp or flat each one was. You can delete a wrong note with ✕.

It also estimates the key (with a runner-up), which you can override. With the key set you get the melody in movable-do solfège (do re mi, with ' and , for higher and lower octaves), handy for choir parts and ear training.

Turn on Snap rhythm to a beat grid to get note values (quarter, eighth, dotted quarter and so on) at a tempo you set or let the tool estimate, on an eighth- or sixteenth-note grid. Hit Play to hear the transcription.

• MIDI: the melody as a standard .mid file with the detected key signature. Open it in MuseScore, GarageBand, Logic, FL Studio or any notation app to turn it into sheet music. With rhythm snapping on, the file uses your tempo and note values; otherwise it keeps your exact timing at 120 BPM.
• Note list (.txt): a tab-separated table with every note, its solfège, start time and length, ready to paste into a spreadsheet.

Recordings can be up to 2 minutes from the microphone; audio files are analyzed for their first 3 minutes.

• Pitch practice: hold a note and watch the needle to train your intonation, or check whether you drift flat at the end of long phrases.
• Writing down a tune: capture a melody stuck in your head before you forget it and open it in your notation software.
• Choir and voice lessons: turn a sung phrase into solfège to practice sight-singing.
• Learning by ear: play a melody on a single-note instrument and see the note names.

• Sing on a clear syllable like la, da or na; consonants such as s and sh have no pitch.
• Hold each note briefly, and leave a tiny gap between repeated notes on the same pitch, otherwise they merge into one long note.
• Avoid heavy vibrato and sliding into notes if you want a precise transcription.
• If your instrument or voice is tuned slightly differently, adjust the A4 reference between 430 and 450 Hz.
• Treat the key and tempo as suggestions: a short melody may fit two keys equally well.

Everything happens in your browser: the microphone audio and any file you add never leave your device. To practice pitching intervals, try the interval ear trainer.