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SACR -- Coreference Chain Annotation Tool


SACR (from the French "Script d'Annotation des Chaînes de Référence") is a tool optimized for coreference chain annotation. It has been published in the following paper:

Oberle B. (2018). SACR: A Drag-and-Drop Based Tool for Coreference Annotation. Proceedings of the 11th Edition of the Language Resources and Evaluation Conference (LREC 2018). Miyazaki, Japan.

You can download the poster here.


SACR is a single webpage. All operations are done in the browser. You can download it and open the index.html file, or use it online at

The workflow is as follows:

(1) Mark the referring expressions:

Mark the referring expressions

(2) Build the coreference chains:

build the coreference chains

(3) Add feature annotations:

add feature annotations

(4) Play and search:

play and search

Getting help

Documentation can be found in the user_guide.pdf file.

Video tutorials (in French) are available on my Youtube channel, with a dedicated playlist:

Source code and licence

Source code may be found on github or

The tool is distributed under the terms of the Mozilla Public License v2. This program comes with ABSOLUTELY NO WARRANTY, see the LICENSE file for more details.