Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. Protectstar records 115,023 monthly visits with -27.7% growth and Paid pricing.
High-quality human data for AI training, evaluation, and research
AI-driven privacy and security apps for phones, desktops and servers
| Dimension / Metric | ||
|---|---|---|
| Official Domain | prolific.com | protectstar.com |
| Pricing Model | Paid | Paid |
| Monthly Visits | 18.7M (18,697,671) | 115.02K (115,023) |
| MoM Traffic Delta | -352.04K (-1.8%) | -44.04K (-27.7%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇺🇸 United States (14.4%) |
| Direct Visits / mo | 12.98M | 41.36K |
| User Rating | 4.6 | 4.4 |
| 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-driven privacy and security apps for phones, desktops and servers
Anti Spy is presented as the first anti-spyware app with dual AV-TEST and DEKRA certification, with a stated 99.87% detection rate, plus dark web checks and camera/recording access monitoring.
Antivirus AI combines a signature engine with on-device machine learning so new and unknown threats are caught in real time without sending your data to the cloud.
iShredder overwrites data using 23 algorithms based on standards from NIST SP 800-88 to DoD 5220.22-M ECE and issues a verifiable erasure report.
Camera Guard and Micro Guard monitor and block camera and microphone access, while Firewall AI governs which apps can reach the network.
Free / Open-sourceAI content detection and a full writing toolkit in one place
Free / Open-sourceAI content detection and a full writing toolkit in one place
Free / Open-sourceAI detection and writing verification built for schools and editors
Free / Open-sourceAI detection and writing verification built for schools and editors
Free / Open-sourcePrivacy-first bot detection and fraud prevention for the web
Free / Open-sourcePrivacy-first bot detection and fraud prevention for the web
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.
Free / Open-sourceDetect, humanize and verify AI content in one place
Free / Open-sourceDetect, humanize and verify AI content in one place
Free / Open-sourceAll-in-one protection for your identity, credit, family, and devices
Free / Open-sourceAll-in-one protection for your identity, credit, family, and devices
Enterprise AI and plagiarism detection for content integrity
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.
Free / Open-sourceDetect AI-generated text and images with benchmark-tested accuracy
Free / Open-sourceDetect AI-generated text and images with benchmark-tested accuracy
Free / Open-sourceAI detector that highlights evidence, not just a score
Free / Open-sourceAI detector that highlights evidence, not just a score
SpecialistAI data infrastructure for building production-grade models
SpecialistAI data infrastructure for building production-grade models
