Frequency Generator: Hz Tone

Tone generator 1 Hz–22 kHz: sine, square, sweep, hearing & speaker test

Frequency Generator turns your phone into a clean, precise tone generator. Pick any frequency from 1 Hz to 22 kHz, see the musical note it matches, and play it through your speaker or headphones.

A BIG, CLEAR DIAL
• The frequency sits in large digits you can read at a glance, with the nearest note (A4 = 440 Hz)
• Drag the logarithmic slider, tap − and + for single steps, or tap the number to type an exact value
• Step size 1 Hz or 0.1 Hz; hold − or + to move ten steps at a time
• Quick presets: 20 Hz, 50 Hz, 100 Hz, 440 Hz, 1 kHz, 10 kHz and 17.4 kHz

FREQUENCY SWEEP
• Glide from 20 Hz to 20 kHz to find rattles, resonances and dead spots in a speaker, subwoofer or room
• The display follows the sweep live so you know exactly where the rattle happens

HEARING RANGE TEST
• With headphones, a tone rises from 8 kHz; tap the moment you can no longer hear it and see your upper limit
• This is a fun check, not a medical hearing test

OUTPUT CONTROL
• Volume slider that starts low, and a Left / Both / Right switch to check each channel and your stereo wiring

PREMIUM TOOLS
• All 6 waveforms: square, triangle, sawtooth, white noise and pink noise on top of sine
• 0.01 Hz precision for tuning instruments, lab work and resonance hunting
• Custom sweep: your own start, end, duration, linear or logarithmic, and loop
• Dual tone: a different frequency in each ear to hear beat frequencies
• Auto-stop timer and export of a 10-second WAV file to share or use elsewhere

FREE TO START
• Tone generator, sweep, hearing test and presets are free, with no ads
• Premium is available as a monthly or yearly subscription or a one-time lifetime purchase. Payments are processed by Google Play Billing, and subscriptions can be cancelled any time in Google Play

SAFETY
Start at a low volume and raise it slowly. Very low or very high tones can be louder than they sound, and long loud tones can damage hearing and small speakers. Tones are for testing, music and entertainment and are not a medical treatment.

PRIVACY
Tones are generated on your device. Nothing is recorded and the app needs no microphone, location or contacts permission. Firebase Analytics and Crashlytics help us see which features get used and fix crashes; you can switch that off in Settings.

No account. No sign-up. No ads.