How do Prolific and Sortio compare in monthly traffic?

Prolific has 18,697,671 monthly visits, while Sortio has 30,821. Traffic estimates describe audience size, not product quality.

How do their growth rates compare?

Prolific has a month-over-month growth rate of -1.8%; Sortio has -14.8%.

How does pricing compare?

Prolific: Paid. Usage-based for requesters: you pay participant rewards plus a platform fee, with custom quotes for large or managed programmes. Participants earn per completed study; joining is free. Sortio: Freemium. Freemium structure with a free tier that includes a one-time AI trial allowance, unlimited rule-based sorting, and up to 5 rules/3 Spaces. Pro is $14.99/month or $99/year (~$8.25/mo) with a monthly AI allowance of up to 5,000 files per run, unlimited Spaces and automations, and unlimited renaming. Team is $290/seat/year ($29/seat/month) with doubled pooled AI allowance and shared workspaces; Enterprise starts around $50/seat/month with SSO, audit logs, and centralized billing. Local LLM/BYOK usage is unmetered and consumes no allowance.