Prolific

Prolific is an online platform for collecting data from verified human participants, used by AI developers and academic and market researchers. It serves three audiences. AI teams use it for human feedback in preference tuning, safety evaluations and benchmarks. Researchers use it to run studies and surveys. Participants sign up to take paid online studies. On the AI side, the platform offers AI Taskers and Domain Experts across areas such as STEM, healthcare and programming, plus human evaluation workflows covering preference ranking and factuality checking. Self serve researchers get more than 300 audience filters, representative and quota samples, custom screening, workspaces, direct participant messaging, unlimited users, and API and no code integrations. The vendor also publishes the HUMAINE framework for evaluating human preference for large language models. Pricing has two routes. The self serve platform is pay as you go with no monthly fees, and a price calculator on the pricing page estimates the cost of a study. Researchers set participant rewards, and Prolific recommends paying at least 9.00 pounds or 12.00 dollars per hour, with a minimum allowed of 6.00 pounds or 8.00 dollars per hour. Managed services are custom quoted and add expert curation, participant training, multi stage quality assurance, a dedicated project team and shared Slack channels. The vendor publishes no figure for its platform fee, and signup is free.