Generate test tones and observe real-time waveform changes. Explore frequency, volume, filters, and modulation effects for audio experiments and learning synthesizer basics.
26.8.4
August 5, 2026
Now you can see what your sound is actually made of. - Tap the waveform to switch to a real-time spectrum view. You can see which harmonics are sounding, and how strongly. - FM (pitch wobble) now offers 5 shapes to choose from. The same settings can sound completely different. New presets included: ray gun, alarm, motor and more. - The harmonic waveform (Harm) is now available to everyone, with 5 dedicated presets added. - Presets can now be exported and imported as files, so you can move them between devices or keep a backup. - The preset screen has been rebuilt: delete in bulk, a visible Save button, and no more confirmation sheet every time you go back. - Fixed several bugs, including purchase state not being reflected on screen.
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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.
