Generate test tones and observe real-time waveform changes. Explore frequency, volume, filters, and modulation effects for audio experiments and learning synthesizer basics.
26.9.16
September 18, 2026
The app now speaks 8 languages. - Added German, French, Italian, Spanish, and Dutch. Choose one under Settings > Language. - Fixed a bug where tapping the currently loaded preset again in the preset list reverted your autosaved changes to the values from when it was loaded. - Fixed the description on the App Icon settings screen being cut off.
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Full version
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Hysteric Oscillator is used for generating test tones and drone sounds, observing real-time waveform changes, and experimenting with audio parameters like frequency, volume, filters, and modulation. It's great for checking speakers, testing audio circuits, and learning synthesizer basics.
The core oscillator and waveform display are free. Additional features like ad removal, two-channel mode, and preset saving are available through an in-app purchase.
Yes, this app contains advertisements. Ad removal is available as an in-app purchase.
Hysteric Oscillator is available for iPhone, iPad, and iPod.
Hysteric Oscillator has an age rating of 9+, making it suitable for younger users interested in audio experimentation.
The latest version, 26.5.21, was released on May 20, 2026. While specific update frequency isn't detailed, this indicates ongoing development.
No, Hysteric Oscillator is designed for audio experiments and quick checks, not for precision measurement. Users should exercise caution, especially with earphones and speakers, and start at low volumes.
The full version of Hysteric Oscillator offers ad removal, a two-channel mode for hearing interference and beating effects, and the ability to save and recall settings as presets.
