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Prolific logo
Prolific
✓ verifiedPaid

Research participant marketplace that gives AI teams and academics fast access to verified, screened human data and feedback.

21M visits/mo
Outlier AI logo
Outlier AI
✓ verifiedFree

Outlier is a platform where experts earn freelance income training and evaluating AI by writing prompts, rubrics and rating answers.

12M visits/mo
Wirestock logo
Wirestock
✓ verifiedPaid

Marketplace pairing AI labs with ethically sourced, creator-made image and video datasets, alongside freelance content gigs.

290K visits/mo
OpenTrain AI logo
OpenTrain AI
✓ verifiedFreemium

Talent marketplace linking AI labs with 257,000+ vetted data labelers and trainers for RLHF, red-teaming and evaluation.

574K visits/mo
Label Studio logo
Label Studio
✓ verifiedFreemium

Open-source data-labeling and AI-evaluation platform for image, text, audio, video and LLM workflows, with a paid enterprise tier.

261K visits/mo
Pricing

No public pricing

No public pricing

No public pricing

Self-Service: 10% marketplace fee + $9.95 contract initiation fee
Managed Service: 20% management fee
Starter: $99/user/mo (up to 12 users, hosted)

Free trial available

Core features
  • 300,000+ verified, screened participants
  • 300+ audience targeting filters
  • Representative and quota-based sampling
  • API and no-code survey tool integrations
  • AI-powered participant quality monitoring (Protocol)
  • Managed services with dedicated project teams
  • Access to vetted domain experts
  • Remote AI-training gig work
  • Tasks: prompt writing, rubrics, rating answers
  • Flexible hours, work from anywhere
  • Weekly, quality-based pay
  • Roles across coding, STEM and languages
  • Free access to paid AI models
  • Large multimodal library spanning images, video, illustration, and vector art
  • Ethically sourced content cleared for AI training use
  • QA-reviewed datasets at scale
  • Custom dataset builds for specific structural needs
  • Freelance project matching based on creator skills
  • Creator earnings and progress dashboard
  • Network of 257,000+ pre-vetted AI data experts
  • AI-matched shortlists with skills tests and interviews
  • Bring talent into any annotation platform, no lock-in
  • Self-service or fully managed engagements
  • Job feed aggregating 20+ platforms for freelancers
  • Open-source multi-type labeling
  • Programmable, customizable interfaces
  • API, SDK and webhooks
  • ML backend for pre-labeling and active learning
  • LLM evaluation and RLHF workflows
  • Enterprise QA, SSO and analytics
Use cases
  • Collecting human preference data for RLHF or model evaluation
  • Running academic behavioral or market research studies
  • Sourcing domain-expert data for specialized AI benchmarks
  • Earning side income as an AI trainer
  • Contributing expertise to improve AI
  • Flexible remote work for grads and experts
  • Gaining hands-on AI and prompt experience
  • Sourcing licensed visual data to train AI models
  • Requesting custom, structured multimodal datasets
  • Freelancers picking up paid photography, illustration, or design gigs
  • Tracking freelance income and project matches
  • Sourcing experts for RLHF and model evaluation
  • Staffing red-teaming and data-labeling projects
  • Scaling annotation teams into existing tools
  • Finding AI training gigs as a freelancer
  • Labeling training data across modalities
  • Human-in-the-loop AI evaluation
  • RLHF and fine-tuning data collection
  • RAG and LLM benchmarking
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