Open-source RLHF platform

Ship better AI with human feedback at scale

The annotation platform purpose-built for RLHF. Collect preference data, ensure quality with gold scoring and IAA, and automate with LLM-as-judge — all in one tool.

✎

Multi-format Annotation

Comparison, rating, and ranking tasks with streaming AI response simulation. Purpose-built for RLHF preference data.

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Quality Assurance

Gold-standard scoring, calibration tests, inter-annotator agreement, and real-time drift detection.

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LLM-as-Judge

Automated batch evaluation with human override. Scale annotation quality without scaling headcount.

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Dataset Versioning

Version, diff, and export annotated datasets in JSONL, CSV, or HuggingFace format. Full audit trail.

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Team & RBAC

Multi-org support with admin, reviewer, and annotator roles. Bulk assignment and review workflows.

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API-first + SDK

Full REST API, Python SDK, and CLI. Automate pipelines with webhooks and API keys.

3
Annotation formats
16+
API endpoints
100%
Open source
SDK
Python + CLI