Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. Roundtable (Proof of Human) records 854 monthly visits with -60.5% growth and Contact for Pricing pricing.
High-quality human data for AI training, evaluation, and research
Prove every user is real — invisibly and continuously.
| Dimension / Metric | | |
|---|---|---|
| Official Domain | prolific.com | roundtable.ai |
| Pricing Model | Paid | Contact for Pricing |
| Monthly Visits | 18.7M (18,697,671) | 854 (854) |
| MoM Traffic Delta | -352.04K (-1.8%) | -1.31K (-60.5%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇺🇸 United States (100%) |
| Direct Visits / mo | 12.98M | 336 |
| User Rating | 4.6 | 3.9 |
| Supported Platforms | Website | Website |
High-quality human data for AI training, evaluation, and research
Filter participants by detailed demographic, professional, and behavioural criteria and reach narrow or representative samples rather than a generic crowd.
Collect human preference data for model fine-tuning, run safety evaluations and red-teaming, and use a feedback API to plug humans into automated pipelines.
Attention checks, honesty screening, and approval workflows help filter out careless or fraudulent responses before you analyse results.
Publish a study and begin collecting responses quickly, with tooling that supports screening, quotas, and longitudinal designs.
Prove every user is real — invisibly and continuously.
Proof of Human runs silently behind login and checkout flows, scoring behavior in under 200 milliseconds without CAPTCHAs or friction for real people.
Continuous behavioral models look for programmatic typing, teleporting mouse movement, jump scrolling, centered clicks and pasted text to catch bots and AI agents mid-session.
The service states it collects no PII and does no cross-site tracking, helping teams meet compliance and privacy requirements.
A single script tag with a site key and user ID is enough to begin verifying sessions, and results include an example session report with explainable signals.
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