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JATOS (Just Another Tool for Online Studies) helps you set up and run your online studies on your own server.

JATOS at a glance:

  • Run studies on your own server. This means that you keep complete control over who can access your result data and can comply with your ethics.
  • Studies run on mobile phones, tablets, desktops, and lab computers - any device with a browser.
  • Use tools like jsPsych, lab.js, OSWeb/OpenSesame, or PsyToolkit to prepare your study - or write all HTML / JavaScript / CSS yourself and have full control.
  • Run group studies where multiple workers interact with each other in real-time.
  • It’s GUI-based, so there’s no need to use the terminal to talk to your server.
  • Recruit participants via Amazon Mechanical Turk, Prolific etc.
  • It’s open-source and free to use.
  • Manage workers, to e.g. make sure that each participant does your study only once.
  • Export/Import studies to facilitate exchange with other researchers.

You can try out JATOS on cortex, our test server.

The whole documentation is available as

Please cite us if you use JATOS for your research.

This is the documentation for JATOS 3 - Are you looking for the docs of JATOS 2? We have a page that covers all about migrating from JATOS 2 to 3.

JATOS is open-source and released under the Apache 2 Licence. The source code is available on github.com/JATOS/JATOS.

Download the latest release