doccano/doccano

Health v2 · maintenance only

Adoption not part of the score

10758 stars · 1826 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Doccano is an open-source, web-based text annotation tool for building labeled datasets for machine learning. It supports text classification, sequence labeling, and sequence-to-sequence tasks with collaborative, multi-user annotation workflows.

Use cases

• label text data for sentiment analysis
• annotate named entity recognition datasets
• create training data for text classification
• build sequence-to-sequence annotation datasets for summarization
• collaboratively label NLP datasets with a team
• prepare labeled datasets for machine learning models

When to choose

• you need a self-hosted, collaborative text annotation tool
• you want to quickly create labeled NLP datasets via a web UI
• you need support for classification, NER, and seq2seq annotation in one tool
• you want a RESTful API to integrate annotation into your pipeline

When to avoid

• you need image, audio, or video annotation rather than text
• you want a fully managed SaaS labeling service without self-hosting
• you need extremely large-scale annotation with advanced workflow automation

Facets

application · maturity active

nlp machine-learning data-science api-framework self-hosted machine-learning data-science python self-hosted cross-platform annotation-tool data-labeling text-annotation sequence-labeling text-classification vue nuxtjs django rest-api collaborative-annotation natural-language-processing data-engineering docker web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="doccano/doccano")