Fine-tuning data is only as good as the experts who generate it.

Define who generates your training data by credentials, expertise, language, and domain knowledge. Production quality in days.

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200,000+ verified participants · 38+ countries · 300+ prescreening attributes

Training data, built to spec

Supervised fine-tuning (SFT)

Expert-generated demonstrations, golden outputs, and instruction-response pairs from domain specialists. The high-quality examples your model learns to imitate.

Domain-expert annotation

Task-specific labels, classifications, and structured annotations from verified professionals - medicine, law, engineering, finance, and more. Training data with real domain authority behind it.

Multilingual & cross-cultural data

Training data from native speakers in 80+ languages and 38+ countries. Fine-tune for the languages and cultural contexts your model will actually encounter - not just English.

Verified domain experts across every field your model needs

PhD researchers, licensed professionals, certified engineers, native speakers, subject-matter specialists. Define the credentials and expertise your training data requires using 300+ prescreening attributes. We verify identity and qualifications - you get training data with domain authority, not guesswork

FEATURES

Plug into your existing training pipeline

Text, image, audio, video - any data format your fine-tuning requires. Integrate via API for programmatic data collection at scale, or connect through 60+ platform integrations. Design custom annotation tasks with AI Task Builder. Your pipeline doesn't change - your data quality does.

FEATURES

Training data quality you can audit, not just trust

Every annotator is identity-verified. Multi-stage quality assurance with calibration against your gold standards. Attention checks, inter-annotator agreement monitoring, and real-time quality dashboards. Not "unmatched quality" - documented, auditable, reportable quality.

FEATURES

Features

Fine-tune or align your AI models more easily with Prolific

Key platform features to help you gather varied types of human feedback from diverse or niche audiences, as you want.

Multiple interaction types

Prolific can integrate with 60+ tools, including your custom tool, so you capture feedback from multiple interaction types.

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Audience filters

Use 300+ audience filters to select annotators with specific skills or backgrounds relevant to your project.

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Participant groups

Work repeatedly with your best-performing taskers by saving participant groups to reuse across projects.

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Transparent pricing

Flat platform fee on top of participant fees that are paid directly to the annotators.

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Seamless integration options

Use our UI or API depending on your needs and project size.

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Support

Engage with our in-house experts to tailor our solutions to your needs.

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How fast-moving AI teams use Prolific

Trusted by AI/ML developers, researchers, and leading organizations across industries.

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Unpacking human preference for LLMs - The HUMAINE framework

The evaluation of large language models faces significant challenges. Technical benchmarks often lack real-world relevance, while existing human preference evaluations suffer from unrepresentative sampling, superficial assessment depth, and single-metric reductionism.

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Text-to-image AI models

Prolific’s streamlined participant management process meant the researchers could achieve a high level of engagement and satisfaction among participants. This was necessary for obtaining high-quality data.

Building breakthrough AI faster

Ai2 reduced human data collection from weeks to hours with Prolific, building state-of-the-art multimodal AI models faster without sacrificing quality.

Better training data. Better models. It's not more complicated than that.

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