Hinokoto Frequency Generator

Hinokoto Frequency Generator plays a steady tone at exactly the frequency you choose. Dial in anything from 20 Hz to 20,000 Hz and pick from sine, square, triangle, sawtooth, or three kinds of noise.

KEY FEATURES
- Set the frequency by typing a value, dragging the slider, or tapping the +/- buttons
- Step by an octave, a semitone, or a custom hertz step from 0.01 to 100 Hz
- Seven waveforms: sine, square, triangle, sawtooth, white noise, pink noise, and brown noise
- Animated waveform display while the tone plays
- Nearest note name with cents offset, plus an adjustable A4 reference pitch from 400 to 480 Hz
- One-tap presets such as 20 Hz, 440 Hz, and 1,000 Hz, and favorites for the settings you use most
- Volume, mute, and left/right balance controls
- Binaural beats with a beat frequency from 1 to 30 Hz
- Frequency sweep that glides from 20 Hz to 20 kHz in eight seconds
- Audibility check that steps through tones from 125 Hz to 16 kHz
- Timer that stops playback after 1 to 60 minutes
- Background playback that keeps the tone going with the screen off, switchable in Settings
- Export the current sound as a 10-second WAV file and save or send it from the share sheet
- Show or hide each part of the screen, from the hertz readout to the presets
- Follows your device's dark mode setting

GREAT FOR
- Checking speakers, earphones, and left/right channels
- Getting a reference pitch for instrument practice or tuning by ear
- Hearing and seeing how frequency and waveform change a sound
- Creating test tones for audio and video projects
- Leaving noise playing with a timer

GOOD TO KNOW
- The app shows a banner ad at the bottom of the screen.
- 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 your device volume low and stop playback right away if you feel any discomfort. Avoid turning up the volume for frequencies you can't hear well.
- The app is available in English and Japanese.
- For questions, use Contact Us in the in-app menu.