Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. StackRef records 765 monthly visits with +184.4% growth and Contact for Pricing pricing.
High-quality human data for AI training, evaluation, and research
Senior cloud, DevOps and security consulting plus a self-hosted hackathon manager
| Dimension / Metric | ||
|---|---|---|
| Official Domain | prolific.com | stackref.com |
| Pricing Model | Paid | Contact for Pricing |
| Monthly Visits | 18.7M (18,697,671) | 765 (765) |
| MoM Traffic Delta | -352.04K (-1.8%) | +496 (+184.4%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇮🇩 Indonesia (100%) |
| Direct Visits / mo | 12.98M | 305 |
| User Rating | 4.6 | 4 |
| 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.
Senior cloud, DevOps and security consulting plus a self-hosted hackathon manager
Hands-on architecture, security, and cost optimization across AWS, GCP, and Azure, led by a CISSP-certified architect with 20+ years of experience.
Focused engagements on hardening cloud environments and supporting compliance, with an emphasis on robust, well-governed infrastructure.
Practical work to reduce cloud spend and right-size infrastructure without sacrificing reliability.
A self-designed, self-hosted, end-to-end internal hackathon manager covering sandbox environments and AI scoring to run innovation events.
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
Free / Open-sourceGoogle's batteries-included framework for scalable web apps
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-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.
SpecialistAI-led customer interviews and research insights at scale
SpecialistAI-led customer interviews and research insights at scale
SpecialistLow-smoke, halogen-free rigid PVC conduit for safer electrical containment
SpecialistLow-smoke, halogen-free rigid PVC conduit for safer electrical containment
SpecialistConnects AI labs with domain experts for data collection, but lacks a self-service marketplace for bulk academic study participants.
SpecialistConnects AI labs with domain experts for data collection, but lacks a self-service marketplace for bulk academic study participants.
