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Argilla

Open-source data curation platform for LLM fine-tuning

open sourceupdated Apr 21, 2026

Argilla is an open-source platform for curating and annotating data for LLM fine-tuning and RLHF workflows. It provides collaborative annotation interfaces for text classification, ranking, and preference labeling with integrated quality metrics. Part of the Hugging Face ecosystem, Argilla supports direct dataset publishing to the Hub and integrates with major training frameworks for seamless model improvement pipelines.

Argilla is purpose-built for the data curation needs of teams fine-tuning large language models. Unlike general-purpose labeling tools, Argilla focuses on the specific annotation patterns required for LLM improvement: preference ranking between model outputs, instruction quality rating, safety classification, and response editing. The platform provides collaborative workspaces where domain experts can annotate data with built-in quality metrics like inter-annotator agreement, annotation velocity tracking, and automated quality checks.

As part of the Hugging Face ecosystem, Argilla offers deep integration with the Hub's dataset infrastructure. Annotated datasets can be published directly to the Hub for use with training frameworks like TRL, Axolotl, and Unsloth. The platform supports programmatic data curation through Python SDK workflows where developers define labeling guidelines, filter candidates using model predictions, and orchestrate annotation tasks at scale. This combination of human annotation and programmatic curation enables efficient dataset creation for instruction tuning, DPO, and RLHF training.

Argilla is open-source and can be self-hosted or used through Hugging Face Spaces. The project maintains an active community contributing annotation templates, integration guides, and best practices for LLM data curation. For teams working on domain-specific LLM fine-tuning where data quality directly determines model performance, Argilla provides the specialized tooling that bridges the gap between raw data and training-ready datasets with the quality controls needed for production AI applications.

Pricing

Free and open-source; Hugging Face hosted option

Platforms

Web UI + Python SDK — self-hosted or Hugging Face Spaces

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FAQ

What is Argilla?

Argilla is an open-source platform for curating and annotating data for LLM fine-tuning and RLHF workflows. It provides collaborative annotation interfaces for text classification, ranking, and preference labeling with integrated quality metrics. Part of the Hugging Face ecosystem, Argilla supports direct dataset publishing to the Hub and integrates with major training frameworks for seamless model improvement pipelines.

Is Argilla free?

Yes — Argilla is open source and free to use. Free and open-source; Hugging Face hosted option

Is Argilla open source?

Yes — Argilla is open source.

What are the best Argilla alternatives?

The top editor-verified Argilla alternatives are Label Studio, Encord, Snorkel AI.