Free
About
Generate any sound frequency between 20Hz and 20,000Hz for relaxation, meditation, or testing hearing. Includes a simple instrument tuner and bonus tracks.
✓Adjustable frequency generator (20Hz-20,000Hz)
✓Hearing range testing
✓Instrument tuner
✓Supports popular relaxation frequencies (432Hz, 528Hz)
✓Includes bonus audio tracks
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What's New in Otosan
1.6.2
November 2, 2026
• Added a "Compare" mode to Binaural Beats. • Microphone permission and other system texts now match all 12 in-app languages. • Minor improvements.
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FAQ
What is Otosan?
Otosan is a utility app that allows you to generate sound frequencies from 20Hz to 20,000Hz. It also includes a simple instrument tuner and bonus audio tracks.
What frequencies can Otosan generate?
Otosan can generate any frequency value between 20Hz and 20,000Hz, allowing for precise audio testing and exploration.
Can Otosan be used for relaxation or meditation?
Yes, Otosan supports popular frequencies like 432Hz and 528Hz, which are often used for relaxation, meditation, yoga, studying, and sleep.
Does Otosan have ads?
No, Otosan is ad-free, providing an uninterrupted user experience.
What devices does Otosan support?
Otosan is currently supported on iPhone devices.
How often is Otosan updated?
The latest version of Otosan was released on November 2, 2026, indicating recent development activity.
What is the age rating for Otosan?
Otosan has an age rating of 4+, making it suitable for a wide range of users.
Does Otosan offer in-app purchases?
No, Otosan does not feature any in-app purchases, and it is available for free.
