# nlplab/brat

brat rapid annotation tool (brat) - for all your textual annotation needs

Repository: https://github.com/nlplab/brat
Canonical: https://ross.abutalabs.com/products/brat
Homepage: http://brat.nlplab.org
Language: Python
License: NOASSERTION
License Family: other
Last push: 2024-07-03T18:47:31+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5696, "days_push": 791, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1879, forks 514 (observed 2026-08-28T04:05:48.435445+00:00)

## What it is
brat is a web-based collaborative text annotation tool for creating text-bound and relational annotations, originally built for NLP and BioNLP research. It runs as a Python server with a browser-based client offering intuitive mouse-driven annotation editing and visualization.

## Use cases
- annotate text spans and relations for NLP datasets
- collaboratively label documents with a team of annotators
- visualize entity and relation annotations over raw text
- create training data for named entity recognition
- link annotations to external ontologies and databases
- annotate biomedical text for research projects

## When to choose
- you need a free, self-hosted, browser-based annotation tool with zero setup for annotators
- your team is doing NLP or biomedical text annotation with spans and relations
- you want centralized data and configuration management for annotation projects

## When to avoid
- you need modern actively developed tooling or a maintained Python 3 stack
- you need annotation types beyond text-bound and relational annotations
- you want a SaaS solution without server maintenance

## Facets
- artifact type: application
- maturity: maintenance
- function: nlp, web-framework, gui, data-science
- domain: artificial-intelligence, web-development, self-hosted
- platform: python, browser, self-hosted
- tags: text-annotation, annotation-tool, collaborative-annotation, nlp-annotation, corpus-annotation, visualization, natural-language-processing, web-server, linux

## Member repositories
- nlplab/brat (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:48.435445+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:14:37.951317+00:00, confidence not recorded.
  - readme: https://github.com/nlplab/brat (fetched 2026-08-28T04:05:48.435445+00:00, sha 8fb2847f9bc2)
  - homepage: http://brat.nlplab.org (fetched 2026-08-29T10:53:24.202048+00:00, sha cc5d7af199a7)
  - site_page: http://brat.nlplab.org/about.html (fetched 2026-08-29T10:53:24.211007+00:00, sha 418064ac762f)
  - site_page: http://brat.nlplab.org/features.html (fetched 2026-08-29T10:53:24.212992+00:00, sha a91abec5726a)
  - site_page: http://brat.nlplab.org/installation.html (fetched 2026-08-29T10:53:24.214851+00:00, sha acf9ee4a53c9)
- Data as of 2026-08-30T08:39:29.467469+00:00.