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

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 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.
  • Write your studies in HTML / JavaScript / CSS - you have full control over what runs in the browser.
  • 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.
  • Connect to the Amazon Mechanical Turk to recruit participants.
  • 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.

The whole documentation is available as

Please cite us if you use JATOS for your research.

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