How do their growth rates compare?

Prolific has a month-over-month growth rate of -1.8%; Whisper (OpenAI) has —.

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. Whisper (OpenAI): Free. Free and open source. The code and weights are published on GitHub under the MIT license with no usage fees or per-minute charges, though you pay for whatever compute you run it on and any OpenAI API usage if you pair it with their hosted services.

What are alternatives to Prolific and Whisper (OpenAI)?

Other tools in related categories include Happy Scribe, Branded, Video Transcriber AI, Deepgram Voice AI, Labelbox.

Prolific vs Whisper (OpenAI) — Traffic (18.7M vs 0), Pricing & Verdict

Open AI Tools

Prolific vs Whisper (OpenAI) — Traffic (18.7M vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Prolific	Whisper (OpenAI)
Official Domain	prolific.com	github.com
Pricing Model	Paid	Free
Monthly Visits	18.7M (18,697,671)	0 (0)
MoM Traffic Delta	-352.04K (-1.8%)	0 (—)
Primary Market & Share	🇺🇸 United States (48.8%)	🌐 Global (—)
Direct Visits / mo	12.98M	0
User Rating	4.6	4.8
Supported Platforms	Website	Open Source

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.