Extreme Time-Stretching

This application/plugin is based on the PaulStretch algorithm (Paul’s Extreme Time Stretch, originally developed by Nasca Octavian Paul), and specifically the PaulXStretch version from Xenakios. The UI has been updated, adapted for various screen sizes, and built for the latest platforms.

Multi-platform, open-source, completely free


PaulXStretch is designed for radical transformation of sounds. It is NOT suitable for subtle time or pitch correction. Ambient music and sound design are probably the most suitable use cases. It can turn any audio into hours or days of ambient soundscape, in an amazingly smooth and beautiful way.


For a few examples of how to use it, check out this tutorial, or this tutorial which was based on the earlier version (even though it looks a little different, most things still apply).


Choose your platform


OS X 10.10 and above
  • Standalone Application
  • AU, VST3, AAX and CLAP plugins
  • 64-bit Intel and ARM (M1)


Windows 7 and above
  • Standalone Application
  • VST3, AAX and CLAP plugins
  • 64bit only


  • Standalone application
  • VST3 and CLAP Plugins
  • Works with JACK and ALSA


iOS 11 or above
  • Standalone Application
  • AUv3 and IAA support


GIT repository
  • Complete GPLv3 source code available
  • Uses JUCE and FFTW3
  • Build it on many platforms


We need your feedback! Please join the PaulXStretch Users group to get updates on new releases and let the community know what you discover while using the software, and get answers to your questions. Or send a message to support@sonosaurus.com.


PaulXStretch is free software, but if you want to help support development, please consider making a monetary donation via PayPal, thanks!