Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. SmartBracket records 0 monthly visits with 0% growth and Paid pricing.
High-quality human data for AI training, evaluation, and research
AI decision intelligence for filling out NCAA tournament brackets
| Dimension / Metric | | |
|---|---|---|
| Official Domain | prolific.com | smartbracket.io |
| Pricing Model | Paid | Paid |
| Monthly Visits | 18.7M (18,697,671) | 0 (0) |
| MoM Traffic Delta | -352.04K (-1.8%) | 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🌐 Global (—) |
| Direct Visits / mo | 12.98M | 0 |
| 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.
AI decision intelligence for filling out NCAA tournament brackets
Generate a complete, internally consistent 63-game bracket in seconds instead of filling every game out by hand.
Tell SmartBracket which pool you are entering and which teams you favor, so picks are shaped around your own contest rather than a generic chalk bracket.
The site describes a patented, decision-science-based approach to weighing matchups rather than a plain popularity or seeding model.
SmartBracket publicly reports percentile results from past ESPN Tournament Challenge entries so you can judge its track record yourself.
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-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.
Free / Open-sourceAI football predictions with a fully public, graded track record
Free / Open-sourceAI football predictions with a fully public, graded track record
Free / Open-sourceAI picks, prop tracking, and real analytics — free on iOS, Android, and web
Free / Open-sourceAI picks, prop tracking, and real analytics — free on iOS, Android, and web
Free / Open-sourceAI player prop research for every league
Free / Open-sourceAI player prop research for every league
SpecialistAI-led customer interviews and research insights at scale
SpecialistAI-led customer interviews and research insights at scale
Free / Open-sourceAI sports predictions with the reasoning behind every pick
Free / Open-sourceAI sports predictions with the reasoning behind every pick
