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An introduction to Blue Cat Audio Blue Cat's Chorus, based on information from the maker and distributors: what it does, how to use it and who it may suit. It is not scored.
From a light ensemble to a deep destructive modulation effect, Blue Cat's Chorus can just do anything, for free!
— Blue Cat Audio official site
What is Blue Cat's Chorus?
Blue Cat's Chorus is a freeware chorus plugin from Blue Cat Audio. The maker says it can cover everything from a light ensemble effect to deep, heavy modulation within a single plugin.
A chorus was originally designed to imitate several voices playing the same notes, using a variable delay between them. This plugin builds on a single-voice vintage chorus and, according to the maker, can also produce deep pitch modulation and bubbling effects.
The stereo version has a Spread control for stereo widening and swirling chorus effects. The LFO can be set to sine or triangle.
It is offered in AU, VST, VST3 and AAX formats for Windows and macOS, with full MIDI control and automation. It is also part of Blue Cat's Free Pack.
Single-voice vintage chorus
A simple chorus that modulates one voice. You can try everything from light thickening to heavy wobble.
Spread control
In the stereo version you can adjust how widely the effect is spread. It may be worth trying on synths or guitars.
Sine or triangle LFO
The LFO shape can be selected to change the character of the modulation.
MIDI and automation
All parameters support MIDI control, automation and MIDI Learn. Version 4.6 (October 2026) expanded MIDI control to notes, pitch bend and more.
No CPU load on idle
Processing shuts down when fed with silence, keeping CPU usage low.
Interface and presets
The interface supports transparency and zoom, and there are preset management, copy/paste and undo/redo.
Smooth bypass
Smooth bypass is designed to avoid noise when enabling or disabling the plugin.
Specifications
| Item | Details |
|---|---|
| Price | Free (freeware) |
| Formats | AU, VST, VST3, AAX |
| Mac | Intel or Apple Silicon, Mac OS 10.9 or newer |
| Windows | SSE2-enabled processor, Windows Vista, 7, 8, 10 or 11 |
| Latest version | v4.6 (2026/10/02) |
| Sample rates | Any |
| Bundle | Free Pack |
What is included and system requirements
- Plugin (Mac and Windows; AAX, VST, VST3; legacy 32-bit builds also listed)
- User's guide
- Mono and stereo versions
How to use it
- Download the version for your OS and format from the Downloads section.
- Run the installer.
- Rescan plugins in your DAW.
- Insert it on the track you want to chorus.
- In the stereo version, adjust Spread for the width.
- Choose the LFO shape, sine or triangle.
- Save settings you like as presets.
- Use MIDI Learn to map parameters to an external controller.
Thickening guitars and synths
A light setting may add thickness and movement.
Pads and strings
A deeper setting may give a swirling modulation.
Vocals and backing parts
A small amount may suggest several voices singing together.
Who it may suit
- People looking for a free vintage-style chorus
- Those who want a chorus controllable by MIDI
- Users who need the same plugin on Mac and Windows
Good to know before you buy
- It is freeware that can be downloaded and used.
- Windows has 64-bit and legacy 32-bit builds.
- A host that supports VST, AU or AAX is required.
- Version 4.6 expanded MIDI control.
Price
Free to use (Blue Cat Audio official site, checked 2026-10-27).
Free.
See Blue Cat's Chorus on the product page
Sources: bluecataudio.com (checked 2026-10-27)
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