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Platform Data
How many participants are active on Prolific right now, updated hourly. A larger pool means more people competing for the same study spots.
Not enough data yet; check back in a few hours.
Last sampled 12 min ago.
Source: Prolific's public eligible-participants endpoint (SINGLE study type), sampled hourly for the 7/14/30/90-day active-in-last-X-days windows — the same screener used on Prolific's own audience checker. Collected and graphed by Prolific Tea; not affiliated with Prolific.
As of the latest hourly sample, about 326,891 participants are counted as active in the Prolific pool over a 90-day window. The live figure at the top of this page updates every hour from Prolific's public eligible-participants data.
The chart above tracks the pool over 1-day, 1-week, 1-month, and 3-month windows so you can see the trend, for whichever recency cohort (7/14/30/90 days) you have selected. The count moves as new participants join and others become inactive, so watching it over several weeks shows whether the pool is expanding or holding steady.
It comes from Prolific's public eligible-participants endpoint, sampled hourly for an unfiltered SINGLE study type. The dropdown lets you switch between the 7/14/30/90-day active windows, matching the same 'active in the last X days' screener on Prolific's own audience checker. It counts participants currently treated as active and available for studies, not the total number of accounts ever registered.
A larger pool means more participants competing for the same study places, so spots can fill faster. Tracking the pool helps you gauge how much competition there is and how quickly to act when a new study appears in your list.
Registered accounts include everyone who has ever signed up. Active participants are those counted as eligible in the recent active window. This page tracks the active figure, because that is what actually determines competition for available studies.