Prolific

Prolific operates an online marketplace that connects organisations with vetted, fairly paid human participants for data collection, surveys, and AI work. Founded in 2014 at the University of Oxford by Phelim Bradley and Ekaterina Damer, it began as a tool for academic researchers needing reliable study participants and has since expanded into AI training and evaluation. Today it supplies human data for tasks like reinforcement learning from human feedback, model red-teaming, AI evaluation, and specialist annotation, serving both academic institutions and commercial AI customers. It is headquartered in London.