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- If we would receive €1 for every download, we would be able to hire a full-time developer. Your contribution helps us!
- OpenSesame is, and will always be, free software. Your contribution is voluntary.
- Donations are handled through PayPal
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The latest stable version is 3.2.5 Kafkaesque Koffka, released on July 28, 2018 (release notes).
Some Python packages, notably PyGaze and PsychoPy, are not compatible with Python 3, and are therefore not available in the Python 3 packages of OpenSesame.
For more information about the OpenSesame runtime for Android, see:
OpenSesame is available through the Cogsci.nl PPA. To add this repository to your software sources and install OpenSesame, run the following commands in a terminal:
sudo add-apt-repository ppa:smathot/cogscinl sudo apt-get update sudo apt-get install opensesame
If you experience missing icons, install
sudo apt-get install gnome-icon-theme-full
Arch Linux packages are available in the Arch Linux user repository.
All platforms (pip)
To install OpenSesame from PyPi (Python package index), type:
pip install python-opensesame
You can install OpenSesame in Anaconda through the CogSci channel:
conda install -c cogsci python-opensesame
Older versions can be downloaded from GitHub releases:
The source code of OpenSesame is available on GitHub.
When (not) to update?
- Update while developing and testing your experiment; it is always best to use the latest version of OpenSesame.
- Do not update while running an experiment; that is, do not update while you are collecting data.
- Run an experiment with the same version of OpenSesame that you used for developing and testing.
Manually upgrading packages
- OpenSesame is a regular Python environment, and you can upgrade packages with
pipas described here:
Tips for system administrators
- When a new major version of OpenSesame is released (with a version ending in 0, e.g. 3.1.0), it is generally followed quickly by one or two maintenance releases (e.g. 3.1.1 and 3.1.2) that address major bugs. Therefore, if you are installing OpenSesame on systems that you do not update often, it is best to wait until the second or third maintenance release (e.g. 3.0.2, 3.1.3, etc.). That way you minimize the risk of rolling out a version of OpenSesame that contains major bugs.
- The Windows installer allows you to silently install OpenSesame using the