chaTree: An oTree Addon Allowing Face-to-Face Communication in Online Group Experiments

Promann, Timo; Mayer, Jan-Patrick; Muehlheusser, Gerd; Roider, Andreas; Tereschenko, Eugen; Wallmeier, Niklas

doi:10.1016/j.econlet.2025.112349

All research

Journal article2025Honesty and cooperation in groupsOpen access

chaTree: An oTree Addon Allowing Face-to-Face Communication in Online Group Experiments

Timo Promann, Jan-Patrick Mayer, Gerd Muehlheusser, Andreas Roider, Eugen Tereschenko and Niklas Wallmeier

Economics Letters 252, 112349

Journal Cite

Participants see and hear each other in the browser; chaTree records who speaks when, so the conversation itself becomes data.

In short

A free add-on that brings live video chat to oTree, so that participants in online group experiments can talk face to face.

What we find

Adds live video chat to oTree with little setup.
Records who talks when, so communication itself becomes data.
Free to use; the article is open access.

Cite

Timo Promann, Jan-Patrick Mayer, Gerd Muehlheusser, Andreas Roider, Eugen Tereschenko and Niklas Wallmeier (2025). “chaTree: An oTree Addon Allowing Face-to-Face Communication in Online Group Experiments.” Economics Letters 252, 112349. https://doi.org/10.1016/j.econlet.2025.112349

@article{promann2025chatree,
  author = {Promann, Timo and Mayer, Jan-Patrick and Muehlheusser, Gerd and Roider, Andreas and Tereschenko, Eugen and Wallmeier, Niklas},
  title = {{chaTree: An oTree Addon Allowing Face-to-Face Communication in Online Group Experiments}},
  year = {2025},
  journal = {Economics Letters},
  volume = {252},
  pages = {112349},
  doi = {10.1016/j.econlet.2025.112349}
}