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Last Commit
May. 23, 2019
Sep. 1, 2010


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PsychoPy is an open-source package for creating experiments in behavioral science. It aims to provide a single package that is:

  • precise enough for psychophysics
  • easy enough for teaching
  • flexible enough for everything else
  • able to run experiments in a local Python script or online in JavaScript

To meet these goals PsychoPy provides a choice of interface - you can use a simple graphical user interface called Builder, or write your experiments in Python code. The entire application and library are written in Python and is platform independent.

There is a range of documentation at:


To contribute, please fork the repository, hack in a feature branch, and send a pull request. For more, see and the developers documentation at

More information

Latest Releases
Release 3.1.2
 May. 15 2019
Release 3.1.1
 May. 14 2019
Release 3.1.1
 May. 13 2019
 May. 10 2019
PsychoPy 3.1.0
 Apr. 26 2019