Hinokoto Frequency Generator

Hinokoto Frequency Generator is a simple tone generator that plays sine waves, square waves, and other test tones at any frequency from 20 Hz to 20 kHz. It also plays white, pink, and brown noise, and can add binaural beats. Use it as a speaker test, a reference pitch, a signal source for audio projects, or just to explore what different frequencies sound like. PRECISE FREQUENCY CONTROL - Type a frequency, drag the slider, or use the +/- buttons - Step by an octave, a semitone, or a hertz step from 0.01 to 100 Hz - See the nearest musical note and how many cents off it is - Adjust the A4 reference pitch between 400 and 480 Hz - Presets at 20, 100, 440, 1,000, 4,000, 10,000, and 20,000 Hz - Save favorites with the frequency, waveform, volume, balance, and binaural settings WAVEFORMS AND NOISE - Sine, square, triangle, and sawtooth waves - White noise, pink noise, and brown noise - Live waveform animation while the sound plays SPEAKER AND AUDIO CHECKS - Frequency sweep from 20 Hz to 20 kHz over eight seconds - Audibility check that plays 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz in turn - Left/right balance control for checking stereo channels BINAURAL BEATS - Play slightly different frequencies in each ear with a beat frequency from 1 to 30 Hz - Quick picks at 2, 4, 6, 10, 15, and 20 Hz HANDY EXTRAS - Timer that stops playback after 1 to 60 minutes - Background playback while the screen is off, switchable in Settings - Export the current sound as a 10-second WAV file to save or share - Choose which controls appear on screen - Dark mode support PLEASE NOTE - This app contains ads. - Binaural beats require stereo headphones that keep the left and right channels separate. - The audibility check is a simple listening check, not a medical test. Presets and frequencies are not intended to produce any particular effect. - Keep the volume low and stop playback if you feel any discomfort. Do not use the app while driving or operating machinery. - Available in English and Japanese. - For questions, use Contact Us in the in-app menu.