Mini Games
Frequency Guessing Game
Hear a pure tone for 2.5 seconds, then find its Hz on a slider. 5 rounds, scored in cents.
GIGGLEUS HZ
Frequency Guessing Game
How to play
- 🎧 A pure tone between 150 and 1,500 Hz plays for 2.5 seconds, then disappears.
- 🎚️ Drag the slider to the frequency you think you heard and lock it in.
- 🎯 5 rounds, up to 100 points each. Your error is measured in cents (100 cents = one semitone).
Mode
Play a 440 Hz test tone and set a comfortable volume first.
Your best (Memory mode)
—
Out of 500 points
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The Frequency Guessing Game plays a pure sine tone, picked at random between 150 and 1,500 Hz, for 2.5 seconds — then hides it. Your job is to find that frequency again on a 100–2,000 Hz logarithmic slider. There are 5 rounds worth up to 100 points each (500 total), and your points halve for every 300 cents (a minor third) you miss by. The results screen lists the real Hz, your guess and your error for every round, and lets you play the two tones back to back.
Error is measured in cents: 1200 × log2(your guess ÷ the answer). 100 cents is one semitone and 1,200 cents is one octave, a doubling of frequency. Cents are used instead of raw Hz because the ear hears pitch as ratios — 100→200 Hz and 1,000→2,000 Hz differ by ten times as many hertz, yet both sound like exactly one octave. The slider follows the same rule, so equal slider distance means an equal musical interval.
When two tones are compared back to back, the smallest frequency difference people can detect (the just-noticeable difference) for pure tones near 1 kHz is reported at roughly 0.2–1% — about 3 to 17 cents — depending on the study and the listener. Matching a tone from memory after it stops is much harder, so errors are usually far larger. Memory mode (no preview) is ranked and lets you send friends a score challenge; Tuning mode lets you hear your slider while you tune, for practice.
Every sound is generated on your device with the browser's Web Audio API — nothing is recorded, uploaded or installed. It's a game, not a hearing test. Higher tones sound louder, so set a low volume with the 440 Hz test tone before you start.
Frequently Asked Questions
Q. How does the frequency guessing game work?
A. A pure tone between 150 and 1,500 Hz plays for 2.5 seconds. When it stops, set the slider where you think it was and lock it in. After 5 rounds you get a score out of 500 and a round-by-round list of the real Hz versus your guess.
Q. What are cents, and how is the score calculated?
A. Cents measure musical distance: 1200 × log2(guess ÷ answer). 100 cents is a semitone and 1,200 cents is an octave. A perfect guess earns 100 points, and the points halve for every 300 cents of error.
Q. How small a frequency difference can people hear?
A. Comparing two tones back to back, listeners can typically tell apart pure tones near 1 kHz that differ by roughly 0.2–1% (about 3–17 cents), varying with training and the individual. Recalling a tone from memory is much less precise.
Q. What's the difference between Memory and Tuning mode?
A. Memory mode gives no preview — you set the slider from memory, and the score counts for the leaderboard and challenges. Tuning mode lets you hear your slider's tone while adjusting; it's for practice and isn't ranked.
Q. Is this a hearing test?
A. No. Results depend on your speakers or headphones and volume, so treat it as a game. Sounds are generated on your device and nothing is recorded or sent to a server. If you're worried about your hearing, see an audiologist.