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Labelbox logo
Labelbox
✓ verifiedFreemium

Data-labeling and RL data platform supplying training data, environments and evaluation for frontier AI labs and enterprises.

1.1M visits/mo
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
SourceBae logo
SourceBae
✓ verifiedFree

Marketplace connecting paid domain-expert contractors to AI labs for data labeling, RLHF and model evaluation work.

29K visits/mo
Pricing

No public pricing

No public pricing

No public pricing

No public pricing

No public pricing

Core features
  • Data labeling across modalities
  • RL environments and reward signals
  • Custom model evaluations and benchmarks
  • Human preference/annotation from an expert network
  • Recursion RL platform for enterprise agents
  • Robotics data (video, trajectories)
  • 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
  • Data annotation and multi-format labeling
  • RLHF and human preference feedback
  • AI model red-teaming and safety testing
  • On-demand vetted ML/prompt engineering talent
  • Synthetic data generation
  • Structured model evaluation and benchmarking
Use cases
  • Building training and evaluation datasets
  • Post-training and RLHF for models
  • Benchmarking model capability
  • Training enterprise specialist agents
  • 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
  • AI labs sourcing domain experts for RLHF projects
  • Companies needing red-teaming of a new model
  • Teams building custom labeled training datasets
  • Domain experts (healthcare, legal, finance) earning remote pay for AI training work
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