HollowTone - Deep Ambient Worlds

HollowTone is a place to explore sound as atmosphere - a quiet world of shifting textures, deep pulses, fluid motion, digital flicker, and soft human-shaped warmth. It isn't a traditional synthesizer or a simple ambient player. It's a procedural audio instrument that lets you shape entire environments with just a few gestures, creating spaces that feel alive, mysterious, and gently immersive.

>>> Get this app on App Store
Universal app for iOS and macOS (AUv3)

Each layer inside HollowTone behaves like its own living entity, generated entirely in real time without samples. Blend them together and new forms emerge: fog-like air, cavernous resonance, flowing noise, glitchy sparks, or distant vocal presence. These sound worlds work beautifully as meditative backgrounds, relaxation environments, dreamlike spaces, or darker atmospheres for games, videos, and creative projects.

Despite the complexity beneath the surface, HollowTone is easy to navigate. The nine macro parameters let you shift the entire soundscape with subtle, expressive control, while the built-in randomizer offers quick ways to discover new ideas - from gentle variations to completely unexpected worlds.

Whether you're seeking calm, tension, inspiration, or a place to wander, HollowTone invites you to explore sound intuitively. No rules, no fixed paths - just a quiet landscape waiting to be shaped.

>>> Where it all began - A Doorway Made of Sound

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HollowTone is a universal application for iOS and macOS. It can work on iPhone and iPad as well as Mac / MacBook M1 and later. HollowTone works on iPhone and iPad standalone, as an Audio Unit or Inter-App Audio module, and supports Audiobus and Ableton Link. On MacOS, HollowTone can works both as a standalone application and as an Audio unit (AUv3) with DAWs and other hosts that support AUv3 plugins. HollowTone has a built-in detailed description of all parameters also available as PDF file on the application site.

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>>> Complete description of HollowTone 1.0 (pdf)

Demos and reviews:

HollowTone (The most detailed review from Mark Hurst)

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