Frequency Generator: Hz Tone

Frequency Generator turns your phone into a clean, precise tone generator and speaker test kit. Pick any frequency from 1 Hz to 22 kHz, see the note it matches and play it through your speaker or headphones. A BIG, CLEAR DIAL • Large digits with the nearest note, period and wavelength; type an exact value with two decimals • Log slider, fine-tune slider, ±1 Hz or ±0.1 Hz steps, and swipe on the scope to nudge • Quick presets, a 15–21 kHz high-tone group and your own presets SPEAKER TEST KIT • Channel walk: left, right, then both, clearly labelled • Polarity A/B: in-phase and out-of-phase noise in turns to check speaker wiring • Stepped sweep through 31 third-octave bands with Back/Next and "rattle here" markers • Tone burst: N cycles on, M cycles off, starting and ending at zero crossings • Reference signals: 1 kHz at −20/−12/−6 dBFS, 50/60 Hz hum and octave-band pink noise • DTMF keypad that plays single keys or a whole number sequence EXACT-LENGTH WAV EXPORT • Export tones, mixes, beats, sweeps, bursts, DTMF, programs and sound effects • The file has exactly the length you choose, saved to Music/Frequency Generator • Log sweep with 1 s of silence at each end, for use with your measurement app MUSIC TOOLS • Two-octave keyboard: hold keys to play up to 8 notes, any waveform • Chord drone with equal or just intonation • Programs: steps of frequency, waveform, duration and glide, played once or looped MULTI-TONE MIXER AND MODULATION • Layers with level, side, waveform, dBFS and balance readouts; add from your presets or an audio file • Tremolo free; vibrato, pulse width and skew in Premium • Binaural and isochronic beats with beat ramps and long sessions with fade-out; audio tones for listening and experiments STABLE BACKGROUND PLAY • Plays in the background with Stop, ±1 Hz and volume controls in the notification • Auto-stop timer with fade-in and fade-out • Battery guide for your phone brand if playback stops during long sessions • Engine settings: buffer size, low latency and sample rate (96 kHz is device-dependent and cannot be verified) • Quick Settings tile, home widget and shortcuts for your last tones FUN EXTRAS • Random sound effects with a seed you can replay and share • Per-ear high-tone check with history. A fun check, not a medical test • Share a setup as a text code and import it from the clipboard WHAT PEOPLE USE IT FOR • Speaker, subwoofer and car audio checks: buzzing panels, room booms, swapped channels and polarity • Music: reference pitches, intervals and chords • Classroom and hobby experiments with sound waves, beats and resonance FREE TO START • Tone, sweep, speaker test kit, DTMF, keyboard, 2-layer mixer, beat presets, 1 min timer and 5 s mono WAV export are free • Premium adds all waveforms, 0.01 Hz steps, 12 layers, custom sweeps and bursts, long stereo export, timers up to 180 min and more • Free with ads, Premium removes them. No full-screen ads during playback or export • Monthly or yearly subscription or a one-time lifetime purchase via Google Play Billing; cancel subscriptions any time in Google Play SAFETY Start at a low volume and raise it slowly. 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. No microphone, location or contacts permission. Imported audio stays on your device. Firebase Analytics and Crashlytics help fix crashes; you can switch that off in Settings. No account. No sign-up.