Prolific Participants vs Mercor Experts

Prolific offers two routes in, which is the detail that matters most here: an open research-participant marketplace you register for, and an expert network hiring for AI training and evaluation work — the latter is where the role listings on this page come from. Mercor Experts is expert-network-only, selectively vetted through a profile and a per-role application. Both operate globally and overlap in medicine, finance, coding, and consulting/ops work, so the real differentiators are pay transparency and volume: Mercor publishes structured rates directly on each listing and its top hourly figures run well above Prolific's, whereas Prolific's rates are inferred from listing text. Read Prolific's posting count carefully too — one real requisition fans out across many city and language variants, so it represents far fewer distinct openings than the raw number suggests.