Airy: Free Mono-Safe Stereo Widener by HARMONICO dsp
Airy is a free mono-safe stereo widener plugin developed by Nicolas Barreau, a Paris-based sound engineer and acoustician, released under his HARMONICO dsp label. The plugin uses a "point source widener" algorithm inspired by the Airy diffraction pattern to expand stereo width without collapsing the center image when summed to mono. You can download it directly from harmonicodsp.com/airy with no account creation or activation step.
How Airy Works
The processor treats the input signal as a coherent point source and applies a physics-based widening model derived from wave optics. Unlike conventional mid/side or Haas-style wideners, Airy preserves phase coherence across the stereo field, making it safe for mono-compatible playback on club systems, broadcast, and mobile devices. The interface exposes a single Width knob (0–100%) and a Bypass switch, keeping the workflow immediate.
Specs & Compatibility
- Formats: VST3, AU, CLAP, Standalone
- Platforms: macOS 11+ (Apple Silicon & Intel), Windows 10/11
- Sample rates: 44.1 kHz – 192 kHz
- Zero latency, low CPU footprint
- License: Free for commercial and non-commercial use, royalty-free
Quick Facts
Airy is completely free with no strings attached — no email gate, no trial timer, no feature-locked tier. The download page serves macOS and Windows installers side by side, and the plugin loads in any major DAW supporting VST3, AU, or CLAP.
FAQ
Is Airy really free with no sign-up?
Yes, the plugin is 100% free, requires no account, and imposes no usage restrictions.
What plugin formats does Airy support?
VST3, AU, CLAP, and a standalone version for both macOS and Windows.
Can I use Airy on commercial releases?
Yes, the license permits royalty-free commercial use in music, post-production, and broadcast.