Prolific vs. Respondent

Prolific's managed research services team brings together over 30 years of combined experience in academic research, acting as an extension of your team for all your complex projects. 

Respondent offers managed services for AI training and evaluation projects.

Prolific recruits, verifies, and monitors its own respondents, tracking behavior over time to maintain quality. 

Respondent also manages a Proprietary panel.

100% Human Guarantee  The 100% Human Guarantee supports high-quality research on Prolific. If a submission in your study is identified as non-human through our Bot authenticity checks, you’ll receive double the cost for that submission as Prolific credits. Since February, we’ve checked over 5 million responses. Just 0.05% were flagged as low authenticity. 

Respondent have no guarantee in place.

Prolific invites only 13% of applicants from their waitlist, based on demand. After 110+ rigorous quality and identity checks, just 55% pass and can start studies and tasks. 

At Respondent, new participants are only weighed against 50+ signals.

On Prolific, studies with broad eligibility criteria typically fill fast, with a median fill time of 2 to 2.5 hours for a sample size of around 100 participants. 

On Respondent, the median time to fill a typical study is approximately 1.5 days.

Prolific goes beyond removing bad actors, investing in educating its participant base about the requirements for AI-moderated studies. This includes a specialized, video-enabled participant pool trained to provide the descriptive, multi-modal feedback that turns a simple interview into a rich data source, backed by interview-experience screening and enforced camera/audio quality standards. 

Respondent has general quality layers in place but no built-in filters to screen for participants with prior interviewing experience and no support function to educate or upskill participants specifically for AI-moderated formats.

Our Expert Network spans 90,000+ professionals across 40 countries, covering business, finance, marketing, engineering, healthcare, and more. Where most panels verify once, we verify continuously. We cross-check every professional against independent signals, including current role, employment history, and LinkedIn presence. Job roles are standardized to O*NET titles, so you can get the expert insight you need fast, without guessing whether someone really is who they say they are. Combine with 300+ consumer filters to further refine your audience. 

Respondent re-verifies a participant's work email every 90 days, but that only confirms the email is still active. It doesn't re-check whether the person's role, employment history, or professional claims are still accurate.

Prolific gives you direct access to 300k+ vetted participants. No sales call required. 

Respondent's core platform is self-serve, pay-as-you-go. Participants can be accessed directly without a sales call for standard studies.

With Prolific, there's no minimum spend. Pay per participant, starting from your first study. 

There is no published minimum spend for Respondent. Pricing is per-session (incentive plus a flat platform fee), payable from the first study.

Prolific has an MCP server that lets your agent launch studies, wait on completion, and receive structured responses without writing API code.

Respondent does not provide an official Model Context Protocol (MCP) server.

Prolific enforces a minimum hourly reward of £6/$8 to ensure all participants are paid fairly. 

Respondent enforces a minimum of $5.00 USD per study.