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PsychoPy is a free cross-platform package allowing you to run a wide range of experiments in the behavioral sciences (neuroscience, psychology, psychophysics, linguistics...)

This is a community project. Users have all the source code. Users are the developers. Users support each other.

Alongside open-source, we're strong supporters of Open Science, and we'll try to encourage and facilitate that wherever we can!

Easy enough for teaching

Universities all over the world are using PsychoPy for teaching students about experiments

Precise enough for psychophysics

Hardware accelerated graphics, best-in class timing, and calibration tools built in

  • Fantastic timing precision (see the timing mega-study for comparisons)!
  • Time and update your stimulus on every screen refresh!
  • Tools to help monitor calibration and wide range of units
  • Hardware-accelerated graphics for stimuli that can be updated on the fly
  • Access to button boxes when you need the utmost precision
  • Automated logging for you to what happened and when
  • OpenGL (and shaders) ready for use when you low-level access to graphics

Flexible enough for everything else

PsychoPy is great for:
  • Dynamic, interactive studies: Free yourself from simple static stimuli! You can update your stimulus interactively on every screen refresh!
  • Neuroimaging: Send and receive triggers to your hardware at precise times
  • Eye-tracking: Access to wide range of hardware (eye trackers, button boxes, trigger systems...)


Want to run your study on the web, so users can access it anywhere?

PsychoPy3 added the facility to run studies online using a high-performance, hardware-accelerated, port of the PsychoPy Python library.

  • Export your experiment from Builder to a web page
  • PsychoPy is the only package with reaction time precision under 4 ms online!
  • Update your stimulus on every frame, just like in the desktop!
  • Upload that to (with easy tools built into the PsychoPy app)
  • Give participants your URL and run your study in the browser!
  • You can recruit participants using Sona, Prolific, Mechanical Turk or similar systems.

Open science

Did you notice that everyone's sharing these days?

  • PsychoPy was written by scientists for scientists
  • You have all the source code. If you want something added or changed you can go ahead and make that change!
  • Over 100 contributors have made changes (small or large) and fed them back to the project for others to benefit!
  • You can share your study on and that means more people might be tempted to base their work on yours (which means more people talking about your work).