🧠Cerebite

Tone Generator

Pick a frequency and waveform, then press play. Start at low volume — especially with headphones.

440 Hz
Frequency Waveform
Volume
Presets
Hearing check (high tones)

⚠️ Protect your ears: keep the volume low and stop if you feel discomfort.

How to use

Type a frequency or drag the slider (it moves logarithmically, like human hearing), choose a waveform, and press Play. Sine is the pure reference tone; square and sawtooth sound louder and buzzier at the same volume because of their harmonics. Handy uses: A440 for tuning instruments, 100–200 Hz to test a subwoofer, 1 kHz as the standard audio reference, and the hearing-check presets to find the highest tone you can hear — most adults top out between 12 and 17 kHz, and the limit drops naturally with age. Always start quiet: high frequencies can be uncomfortable at volumes that feel fine for low ones.

More to try

🎵

Metronome

🎹

Perfect Pitch Test

🖱️

Click Speed (CPS)

⚡

Reaction Time Test

⌨️

Typing Speed Test

🔴

Connect Four

Frequently asked questions

Why can't I hear the highest presets?
Human hearing tops out around 20 kHz in childhood and declines naturally with age — by 40 most people hear little above 15 kHz, and 17 kHz+ is mostly teenagers. Your speakers matter too: many laptop speakers cannot reproduce very high or very low tones at all, so test with headphones before concluding anything about your ears.
What is a safe volume for testing?
Start with the volume slider low (the default is gentle) and your device volume at or below half. A test tone only needs to be just audible — there is no benefit to loud playback, and sustained loud pure tones are harder on ears than music at the same level. Stop immediately if you feel ringing or discomfort.
What are the common frequencies used for?
A440 (440 Hz) is the international tuning standard for instruments. 1 kHz is the reference tone used to calibrate audio gear. 50–80 Hz reveals what a subwoofer really does, 3–4 kHz is where human hearing is most sensitive, and sweeping 8–18 kHz is the classic quick hearing-range check.