A LITTLE GAME OF LISTENING
What’s that note?
A fan. A piano. The sound you can’t unhear.
MUSICAL PITCH · ESTIMATE
A note will appear here
Nearest note, plus the distance from it
A4 = 440 Hz is the violin’s open A string at standard concert pitch. The blue key marks middle C, C4 = 261.63 Hz.
Fundamental level
Waiting for a tone—dBFS · RMS estimateFundamental band only · thin line holds its recent high · digital level, not room dB SPL.
A window into the sound around you.
Start listening, or explore a demo.The picture returns when you reveal the answer.
Tap a bright line to inspect its frequency.
Steady tones will appear here as we listen.
A few notes on listening
For your game: let one person hold the phone near the sound. Hide the answer, make your guess, then freeze and reveal. The big letter is the nearest musical note; the number is the estimated frequency. Middle C is C4, about 261.6 Hz.
Hear the family. Musical pitch mode groups steady peaks at roughly 2×, 3×, 4× and other multiples of a common frequency. That helps keep a bright overtone from replacing the underlying note. When the fundamental itself is absent, a supported estimate is labelled “Inferred.” Individual tones and Strongest modes are available under Adjust view.
A useful estimate, not a verdict on your ears. Multiple sound sources, inharmonic sounds, and weak signals can still confuse the estimate. The method is a harmonic heuristic, not a complete model of human hearing. Other candidates appear below so you can choose the one you mean.
Keep it local. Audio is analysed in memory on this device. There is no recording, audio storage, upload, or account. View preferences are saved on this device. On iPhone, open in Safari, then Share → Add to Home Screen.
Microphone off. The app requests noise suppression, echo cancellation, and automatic gain control off when your browser allows it.