A downloadable synthesizer for Windows, macOS, and Linux

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Fluctus is a free 3-operator FM synthesizer that's incredibly simple yet very flexible in the sounds it can produce.

Discord: https://discord.gg/aHnUxztsVe

Key features:

  • 3 operators (with variable brightness control), soft and hard saturators, 1 multi-mode filter, ping-pong delay and phaser.
  • Streamlined single page user interface with scaling ranging from 100% to 200%.
  • Over 60 builtin patches in the factory ROM bank, accessible from the patch browser.
  • Full support for the new CLAP plugin API.
  • No copy protection or DRM.

The plugin is available in both 32-bit and 64-bit formats for Windows, and is also available in 64-bit for Linux and macOS (with native Apple Silicon support).

Supported hosts:

  • The new CLAP plugin format, including support for polyphonic non-destructive modulation. Confirmed working in Bitwig 4.3.
  • The native FL Studio plugin format, including support for slide/glide notes. Requires FL Studio 9 or newer.
  • Audio Unit hosts.
  • Standalone.


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Click download now to get access to the following files:

FluctusSynthWindows_v1.1.7.zip 5 MB
FluctusSynthMacOS_v1.1.7.zip 13 MB
FluctusSynthLinux_v1.1.7.tar.gz 4 MB
OldFluctusSynthWindows_v1.0.16.zip 4 MB
OldFluctusSynthBetaMacOS_v1.0.16.zip 8 MB
OldFluctusSynthLinux_v1.0.16.tar.gz 4 MB