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Version: 3.9.x

What is JATOS

JATOS (Just Another Tool for Online Studies) helps you effortlessly set up and run your online studies directly on your own server. This gives you complete control over your research data and helps ensure compliance with ethical guidelines.

MindProbe: A Free Server for Online Experiments​

If you don't really need your own server, you can use MindProbe: a free server available for hosting online experiments, powered by JATOS. This initiative is sponsored by the European Society for Cognitive Psychology (ESCoP), and includes support from OpenSesame.

Let us know how you use JATOS!​

Please take a moment to complete our short, 3-minute survey about how you use the software.

JATOS at a Glance​

  • Full Control of Your Own Data: Run studies on your own server to maintain complete control over your result data and comply with ethical requirements.
  • Free & Open-Source: JATOS is completely open-source and free to use, released under the Apache 2 Licence. You can find the source code on GitHub.
  • User-Friendly Interface: JATOS features a GUI (Graphical User Interface), meaning you will not need to know terminal commands to manage your server.
  • Flexible Study Creation: JATOS is compatible with popular tools like OpenSesame, jsPsych, lab.js, PsyToolkit, or PsychoPy. Standard HTML, JavaScript, and CSS code is of course also possible.
  • Device Agnostic: Code your studies to run on mobile phones, tablets, desktops, and lab computers — any device with a browser.
  • Effortless Collaboration: Export and import studies with ease, facilitating exchange with other researchers.
  • Real-time Group Studies: Conduct dynamic group studies where multiple participants can interact with each other in real time.
  • Compatible with Participant Recruitment platforms: JATOS is easy to integrate with platforms like Prolific, SONA, or MTurk.
  • Participant Management: Manage participants effectively, for example, to ensure each individual completes your study only once.
  • Integrate with Your Tools: Leverage the JATOS API to integrate JATOS with your existing research workflows and custom tools.
  • Ready to give it a spin? You can try out JATOS right now on cortex, our test server.

Watch an Introduction to JATOS​



JATOS in Action: Trusted by Researchers Worldwide​

Almost 300 studies have already successfully collected data using JATOS! If you use JATOS for your research, please consider citing us.