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About PsychoPy

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PsychoPy is an open-source application allowing you run a wide range of neuroscience, psychology and psychophysics experiments. It’s a free, powerful alternative to Presentation™ or e-Prime™, written in Python (a free alternative to Matlab™ ).

PsychoPy provides a unique choice of interface: use the Builder interface to build rich, flexible experiments easily or use the Coder interface to write extremely powerful experiments in the widely-used Python programming language. The best of both worlds!


Buy the official book!

You can now buy the book, Building Experiments in PsychoPy from Sage Publishing!

300 pages of great advice on how to create better experiments with a combination of Builder and some code snippets! Suitable for a wide range of audiences, with separate sections for:

  • beginners (suitable for undergraduate teaching)
  • professionals (more technical detail for the afficionado)
  • and specialists (with particular use cases like EEG, fMRI, psychophysics).

PsychoPy is going Professional and Online!

We’re delighted to announce that The Wellcome Trust has granted us a sum of money that will allow us to hire a full-time developer, meaning that we will become more professional than ever and, critically, also funding for Ilixa Ltd. to complete the job of building the online experiment system that many of you have been waiting for! See the discourse post for further details of what we’re planning.

Latest version: 1.90.2 was released May 2018.

This version supports Python3 and Python2 (although some hardware may not work on both).

See the full Changelog