oTree Hub - Build experiments with AI

The oTree AI Builder is a single platform that can build and run all your behavioral experiments, from surveys, to psychological stimulus-response experiments, to real-time multiplayer games.

A stable AI-driven stack

Although LLMs have the inherent ability to program very sophisticated apps, they struggle with unfamiliar domains and poorly coordinated development stacks.

A hand-drawn tower of mismatched blocks leaning further at each level: frontier LLM, missing domain training, overly permissive harness, backend and frontend frameworks with 3rd party dependencies, hosting, add-ons. Panicking participants on top. — Ad-hoc LLM-coded apps

A hand-drawn tower of evenly stacked green blocks: frontier LLM, oTree-specific training, strict harness, oTree framework, automated upgrades, automated tests, hosting, health monitoring. Happy participants on top. — oTree Platform

Behavioral experiments can be complex and mechanically intricate. We provide a carefully tested platform that allows them to run properly.

Everything you need, built in

Easy for non-coders: no programming experience required
Immediate deployment to a live working website you can send to colleagues or participants
Integrated recruitment and payment: we support Prolific, MTurk, PayPal, Venmo, and more.
Automatic backups: your work is continuously saved, and you can auto-download local code archives.
Full oTree capabilities: supports anything you can build with oTree, and more
Built by the author of oTree: 100% integrated with oTree's designs and workflows

AI is changing how fast behavioral research can be done. If you're looking for a way to give your research group an edge, oTree AI is a great opportunity. Contact us at and ask about a license for your group, or try it now for yourself.