• Spectral analyzer audio plugin based on the Constant-Q transform.
  • Offers logarithmic equally spaced resolution across all octaves.
  • Covers 48 bins per octave (1/8th tone) and 10 octaves.
  • Multithreading to keep it lightweight on the audio thread.
  • The original intention for this plugin was to serve as visualization for my CQT implementation, but I hope it is also useful it is in an actual music production context.


  • The plugin is completely open-source:


  • In general I’m happy about any kind of feedback, questions or suggestions.



This software is provided free of charge but ChromaDSP retains copyright.
You are not allowed to redistribute this software without explicit permission from ChromaDSP.
You are not allowed to sell or to rent this software. You are not allowed to reverse engineer this software.
You are allowed to use this software for any educational and artistic application including commercial music production.
This software is provided ‘as-is’, without any express or implied warranty. In no event will ChromaDSP be held liable for any damages arising from the use of this software.

The plugin is not notarized or signed.


  • x64
  • MacOs >=10.09 (not really tested), no M1