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

During the COVID-19 pandemic many scientists can’t proceed with their usual lab experiments anymore and move to online versions of their studies. But setting up a JATOS instance is not always easy. We want to support the scientific community by providing a JATOS server for free.

Please complete our short survey on how (much) you use JATOS (ca. 3 min). It’s very important for us!

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 MTurk, 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.
  • Upload files, e.g. audio or video recordings
  • Export/Import studies to facilitate exchange with other researchers.
  • You can try out JATOS on cortex, our test server.


Watch an introduction video:



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

Several studies have sucessfully collected data using JATOS already! Please cite us if you use JATOS for your research.

Download the latest release