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Learn more:


Try brat online

(username: "crunchy", password: "frog")

Take a tutorial: news, (reset), bio (reset),

Runs in your browser: no installation required

Intuitive annotation visualization and editing.


Create your own local brat installation:

Download v1.3

(MD5, SHA512, Repository (GitHub), Older versions)

Manage your own annotation effort

Easy to set up: installation instructions

Instructions for upgrading to v1.3 (Crunchy Frog)

Open source (MIT License)

Current version: v1.3 Crunchy Frog (2012-11-08).

brat rapid annotation tool

online environment for collaborative text annotation