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OpenSesame is a program to create experiments for psychology, neuroscience, and experimental economics. The latest stable version is 4.0 Melodramatic Milgram (release notes).


  • 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


Mathôt, 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

Mathôt, S., & March, J. (2022). Conducting linguistic experiments online with OpenSesame and OSWeb. Language Learning. doi:10.1111/lang.12509
Related preprint (not identical to published manuscript)

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