How do Prolific and Seda compare in monthly traffic?

Prolific has 18,697,671 monthly visits, while Seda has 2,159. 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%; Seda has -21.5%.

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. Seda: Freemium. Freemium-style entry with a 14-day free trial; the homepage illustrates about $19/mo for Starter (up to 3 seats) and $49/mo for Pro (unlimited seats plus SSO), and the main route to buy is to book a call.