How do their growth rates compare?

Prolific has a month-over-month growth rate of -1.8%; Yabble has -12.1%.

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. Yabble: Paid. Paid subscriptions. Yabble advertises plans starting below $800/month, with published annual tiers at $8,900, $20,000, $40,000 and $80,000 USD, plus a bespoke Enterprise tier. All plans include unlimited user licences, API access and the full toolbox of Count, Gen and Virtual Audiences. Pricing is arranged through a demo with the sales team.

What are alternatives to Prolific and Yabble?

Other tools in related categories include Branded, Labelbox, Appen, Outset.ai, SuperAnnotate.

Prolific vs Yabble — Traffic (18.7M vs 2.44K), Pricing & Verdict

Open AI Tools

Prolific vs Yabble — Traffic (18.7M vs 2.44K), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Prolific	Yabble
Official Domain	prolific.com	yabble.com
Pricing Model	Paid	Paid
Monthly Visits	18.7M (18,697,671)	2.44K (2,437)
MoM Traffic Delta	-352.04K (-1.8%)	-337 (-12.1%)
Primary Market & Share	🇺🇸 United States (48.8%)	🇺🇸 United States (100%)
Direct Visits / mo	12.98M	959
User Rating	4.6	4.3
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.