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PsychoPy

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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.

Note: this repository now contains only the PsychoPy library. The code for the application user interface is now in separate repositories for PsychoPy Studio (for the modern web-based GUI) and PsychoPy App (for the legacy wxPython GUI).

There is a range of documentation at:

Contributions

To contribute, please fork the repository, hack in a feature branch, and send a pull request. For more, see CONTRIBUTING.md and the developers documentation at https://www.psychopy.org/developers

Code Status

Dev branch: GH tests dev CodeQL (dev)

Release branch: GH tests release CodeQL (release)

More information

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2026.2.3 This release

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