Choose 9–22 kHz
The app generates a pure tone at your selected frequency and loops it — no recordings.
Choose a tone and start with one tap.
Presets for camping, trails and indoors,
plus a timer that fits your night.
Results may vary by environment.





The app generates a pure tone at your selected frequency and loops it — no recordings.
Use the slider, or pick from 17–22 kHz preset cards.
Labels for camping, wooded trails, indoors and more.
Set start and end times, use 1, 3 or 5-hour quick options, or go unlimited.
Keeps playing while you use other apps or the screen is off.