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OpenSesame is a tool to create experiments for psychology, neuroscience, and experimental economics.

Copyright, 2010-2022, Sebastiaan Matht and contributors.

Build Status


  • A user-friendly interface a modern, professional, and easy-to-use graphical interface
  • Online experiments run your experiment in a browser with OSWeb
  • Python add the power of Python to your experiment
  • JavaScript add the power of JavaScript to your experiment
  • Use your devices use your eye tracker, button box, EEG equipment, and more.
  • Free released under the GPL3
  • Crossplatform Windows, Mac OS, and Linux


Each major version of OpenSesame lives in its own branch. The default branch is currently loewenfeld.

  • gibson - 2.8
  • heisenberg - 2.9
  • ising - 3.0
  • james - 3.1
  • kuhn - 3.2
  • loewenfeld - 3.3


OpenSesame is a graphical experiment builder. OpenSesame provides an easy to use, point-and-click interface for creating psychological/ neuroscientific experiments.


Matht, S., Schreij, D., & Theeuwes, J. (2012). OpenSesame: An open-source, graphical experiment builder for the social sciences. Behavior Research Methods, 44(2), 314-324. doi:10.3758/s13428-011-0168-7

Matht, S., & March, J. (in press). Conducting linguistic experiments online with OpenSesame and OSWeb. Language Learning.
Related preprint (not identical to published manuscript)


OpenSesame is distributed under the terms of the GNU General Public License 3. The full license should be included in the file COPYING, or can be obtained from:

OpenSesame contains works of others. For the full license information, please refer to debian/copyright.


Installation instructions and documentation are available on the documentation website ...

... which is itself also hosted on GitHub:

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