# Prolific

> Prolific connects researchers, product teams and AI developers with vetted, paid participants for online studies, model evaluation and training data. Its marketplace combines audience targeting, participant verification and payments with APIs, annotation tools and managed research services.

- **Founded:** 2014
- **Headquarters:** London, United Kingdom
- **Founders:** Phelim Bradley (Co-founder and CEO; previously CTO), Ekaterina (Katia) Damer (Co-founder and former CEO)
- **Products:** Participant recruitment platform, AI Task Builder, AI Taskers, Domain Experts, Human Data API
- **Notable:** Joined Y Combinator’s Summer 2019 batch., Announced £25 million Series A funding in July 2023., Reported more than US$100 million paid to participants by July 2023.

## Products & services

- **Participant recruitment platform** — Self-service recruitment, audience filtering, participant management and payments for online research.
- **AI Task Builder** — An integrated annotation workflow for uploading datasets, defining rating and response tasks, recruiting taskers and collecting training or evaluation data; early access launched in December 2024.
- **AI Taskers** — Participants assessed for AI evaluation, comparative reasoning and factual verification; announced as available in March 2025.
- **Domain Experts** — Credential- or skills-verified professionals in healthcare, programming, STEM and other specialist fields.
- **Human Data API** — Programmatic access to recruitment and human-data workflows.
- **Managed services** — Custom research and AI data collection with sourcing, participant training, quality assurance and reporting.
- **Protocol** — Layered participant verification, ongoing fraud detection, in-study safeguards, performance controls and participant engagement; upgrade described in September 2025.
- **Human and agent trajectory capture** — Tools demonstrated in September 2026 to capture and compare human desktop task execution and AI agent web runs using a shared schema.

## Achievements

- Joined Y Combinator’s Summer 2019 batch.
- Announced £25 million Series A funding in July 2023.
- Reported more than US$100 million paid to participants by July 2023.
- Named to Tech Nation’s Future Fifty 2026 cohort.

## Latest updates

- **2026-09** — September 30: published lessons from a London agent-development panel hosted with AI Circle.
- **2026-09** — September 24: CEO discussed Future Fifty recognition and reported a 300,000-plus human network.
- **2026-09** — September 2: demonstrated human and agent trajectory capture tools.
- **2026-08** — August 26: detailed credentials-checked healthcare recruitment, including more than 20,000 healthcare professionals across over 35 specialties.

## Links

- Website: https://www.prolific.com/
- LinkedIn: https://www.linkedin.com/company/prolific-com/
- Twitter/X: https://twitter.com/Prolific
- GitHub: https://github.com/prolific-oss/
- YouTube: https://www.youtube.com/@JoinProlific

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Profile page: https://yespress.io/prolific
Published by YesPress — https://yespress.io
Last updated: 2026-10-09