How do their growth rates compare?

Prolific has a month-over-month growth rate of -1.8%; SourceBae has +20.1%.

How does pricing compare?

Prolific: Paid. Usage-based for requesters: you pay participant rewards plus a platform fee, with custom quotes for large or managed programmes. Participants earn per completed study; joining is free. SourceBae: Contact for Pricing. Contact for pricing. SourceBae quotes custom rates per project based on task type, expert seniority, data modality and volume. Job seekers can apply through the site, and companies request a scoped proposal via a demo or project discussion.

What are alternatives to Prolific and SourceBae?

Other tools in related categories include Mercor, Workable, Branded, CodeSignal, Labelbox.

Prolific vs SourceBae — Traffic (18.7M vs 21.73K), Pricing & Verdict

Open AI Tools

Prolific vs SourceBae — Traffic (18.7M vs 21.73K), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Prolific	SourceBae
Official Domain	prolific.com	sourcebae.com
Pricing Model	Paid	Contact for Pricing
Monthly Visits	18.7M (18,697,671)	21.73K (21,727)
MoM Traffic Delta	-352.04K (-1.8%)	+3.63K (+20.1%)
Primary Market & Share	🇺🇸 United States (48.8%)	🇮🇳 India (80.7%)
Direct Visits / mo	12.98M	3.66K
User Rating	4.6	4.1
Supported Platforms	Website	Website

Prolific

High-quality human data for AI training, evaluation, and research

Verified, targetable participant pool

Filter participants by detailed demographic, professional, and behavioural criteria and reach narrow or representative samples rather than a generic crowd.

AI data and human feedback

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.

Built-in data-quality controls

Attention checks, honesty screening, and approval workflows help filter out careless or fraudulent responses before you analyse results.

Fast study launches

Publish a study and begin collecting responses quickly, with tooling that supports screening, quotas, and longitudinal designs.