Pitch Detector

Real-time pitch feedback is the fastest way to fix intonation problems in singing practice. Hit "Start Listening", then sustain a vowel on a target note. The display shows the closest note name (e.g., A4), the exact frequency in Hz, and a cents offset between −50¢ and +50¢. A negative offset means you are flat (below the target); positive means sharp. Aim to hold the indicator at 0¢ for several seconds before moving to the next note — this trains both your ear and your vocal muscle memory at the same time.

Sustained vowels work best — open sounds like "ah" and "oo" produce a stable fundamental that the detector can lock onto. Consonants and quick transients confuse the algorithm. For scale practice, sing up a major scale one note at a time and check that each step lands within ±10¢ of the target. For interval training, sing a root note, then a third, fifth, or octave above it, and verify each pitch independently against the display. To find your comfortable singing range, glide slowly from your lowest sustainable note to your highest and note where the readings stop being clean — that is your usable range. Pair this with the Chord Detector when you want to sing harmonies over a recorded backing track, or use the Metrónomo to keep your warmup tempo steady while you focus on pitch.

The detector works as a chromatic tuner for any monophonic acoustic instrument. Play one note at a time, sustain it for one to two seconds, and read the cents offset. A reading of 0¢ means the note is perfectly tuned; ±5¢ is inaudible to most listeners; beyond ±20¢ the note will sound noticeably off in an ensemble. The display range is ±50¢, which covers a full semitone of correction in either direction.

For guitar tuning, work through the six standard strings — E2, A2, D3, G3, B3, E4 (low to high). Pluck each string firmly and let it ring; adjust the tuning peg until the cents reading settles near zero. For violin, viola, and cello, the open strings are tuned in perfect fifths — bow each string sustained and tune to concert pitch. Brass players can warm up on a long tone and check pitch drift as the instrument heats up; woodwinds should tune at performance temperature, not cold. Most ensembles use A=440 Hz as the concert reference, though some orchestras prefer A=442. Tip: turn off vibrato, chorus, reverb, or any effect pedals before tuning — modulation effects smear the fundamental frequency and make accurate readings impossible. If you also need to find the musical key of a recorded track, use the Buscador de llaves, or check the harmonic content of a sound with the Spectrum Analyzer.

Within 1 cent for sustained tones. Noisy environments or very low/high pitches may reduce accuracy.

Yes. Play each string and check the note name and cents display. Tune until the offset shows 0 cents.

Monophonic instruments (voice, flute, guitar single notes) work best. Chords and polyphonic sources are harder to track — use the Chord Detector for those.

The detector samples your microphone signal directly using the Web Audio API and runs autocorrelation locally on your device. Your audio stream never leaves your machine — it is processed in real time by JavaScript running locally on your device and discarded immediately.

Yes. Sing a sustained vowel on a target note (e.g., A4 = 440 Hz). The display shows the detected note and the cents offset. Practice keeping the indicator centered at 0¢ for several seconds. For interval training, sing two notes in sequence and verify each pitch independently. Pair it with the Chord Detector for harmonic context.

Yes. Any monophonic instrument that produces a clear, sustained pitch works — trumpet, saxophone, clarinet, flute, violin, cello, bass. Tune to concert pitch (A=440 Hz by default). Play one note at a time for the cleanest reading. Polyphonic instruments like piano or guitar chords need the Chord Detector instead.