Abstract: Cree is a toolbox to design and run economic experiments. Cree places very few restrictions on the devices facing subjects, thus Cree experiments can be run in a myriad of settings. This opens up a new path for researchers, however the path is not without obstacles. This paper describes how many of these obstacles are alleviated though the technical design of Cree. The main remaining obstacle is the selection process, especially if subjects can self-select into experiments. Read full paper