psychopy 2026.2.1

PsychoPy provides easy, precise, flexible experiments in behavioural sciences

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:

• PsychoPy Homepage
• Youtube
• The textbook, Building Experiments in PsychoPy
• The discourse user forum

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:

Release branch:

More information

• Homepage: https://www.psychopy.org
• Forum: https://discourse.psychopy.org
• Issue tracker: https://github.com/psychopy/psychopy/issues
• Changelog: https://www.psychopy.org/changelog.html