Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. Semafind records 846 monthly visits with 0% growth and Contact for Pricing pricing.
High-quality human data for AI training, evaluation, and research
Independent AI, ML and data science research & engineering consultancy
| Dimension / Metric | | |
|---|---|---|
| Official Domain | prolific.com | semafind.com |
| Pricing Model | Paid | Contact for Pricing |
| Monthly Visits | 18.7M (18,697,671) | 846 (846) |
| MoM Traffic Delta | -352.04K (-1.8%) | +846 (0%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇺🇸 United States (72.2%) |
| Direct Visits / mo | 12.98M | 237 |
| User Rating | 4.6 | 4.1 |
| 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.
Independent AI, ML and data science research & engineering consultancy
Bespoke algorithms and models built for problems that generic tools cannot solve, from computer vision to recommendation systems.
A structured ideation, prototype and integration process designed to de-risk research-heavy projects before full rollout.
Products including SemaReader for semantic reading and knowledge-graph creation, and SemaDB, a vector database for similarity search.
Hands-on data analysis, anomaly detection and predictive modelling engagements shaped around specific business goals.
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.
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.
SpecialistAI data infrastructure for building production-grade models
SpecialistAI data infrastructure for building production-grade models
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
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-sourceCommunity hub for data science, machine learning and AI practitioners
Free / Open-sourceCommunity hub for data science, machine learning and AI practitioners
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.
AI-driven software group building RegTech, biometrics and fintech products for enterprises
AI-driven software group building RegTech, biometrics and fintech products for enterprises
SpecialistAI-led customer interviews and research insights at scale
SpecialistAI-led customer interviews and research insights at scale
Applied AI engineering and consulting for enterprise deployments
AI & machine learning consulting that ships production systems
AI & machine learning consulting that ships production systems
