Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. UserCall records 16,638 monthly visits with -10.2% growth and Paid pricing.
High-quality human data for AI training, evaluation, and research
AI-moderated voice interviews with findings you can defend
| Dimension / Metric | | |
|---|---|---|
| Official Domain | prolific.com | usercall.co |
| Pricing Model | Paid | Paid |
| Monthly Visits | 18.7M (18,697,671) | 16.64K (16,638) |
| MoM Traffic Delta | -352.04K (-1.8%) | -1.9K (-10.2%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇺🇸 United States (62.3%) |
| Direct Visits / mo | 12.98M | 6.64K |
| User Rating | 4.6 | 4.3 |
| 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.
AI-moderated voice interviews with findings you can defend
Live, two-way voice conversations that follow your guide, decide in the moment whether to probe or move on, and carry context from each link.
Fire a short interview right after signup, drop-off, checkout abandonment, cancellation or another key moment, while the context is still fresh.
Every theme opens to the participants behind it, and findings are flagged as strong, weak, overstated or contradicted so thin evidence is called thin.
One guide runs across markets in over 50 languages and voices, so multi-market studies no longer need separate translators or interviewers.
Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.
Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.
AI-moderated customer interviews that turn conversations into decisions
AI-moderated customer interviews that turn conversations into decisions
AI communication platform for sales and support teams
SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
Enterprise-grade data annotation and AI alignment workforce, but less self-serve for academic study recruitment and casual surveys.
Qualitative research depth at survey scale, moderated by AI
Qualitative research depth at survey scale, moderated by AI
SpecialistAI data infrastructure for building production-grade models
SpecialistAI data infrastructure for building production-grade models
Turn customer voices into confident decisions
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
Expert-led, AI-native primary research for private equity, healthcare and life sciences — consulting-grade studies delivered in about two weeks.
AI-led customer interviews and research insights at scale
AI-led customer interviews and research insights at scale
