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CorA (Corpus Annotator)

Build Status codecov Documentation Status

CorA is a web-based annotation tool for non-standard language data.

The source code of CorA is provided under the MIT license. See LICENSE for details.

If you have any questions about this project, please contact Marcel Bollmann (


To host CorA on your own machine, you should have at least the following:

  • A web server, such as Apache

  • PHP 5.5+ or PHP 7+ with the following extensions:

    • dom
    • json
    • libxml
  • MySQL 5.5+ or MariaDB 10.0+

If you plan to build CorA yourself, further dependencies are needed; see for details.


The easy way to install CorA is to simply download an archive containing a prepared build. If you want to modify parts of the source code, run unit tests, etc., you should follow the instructions in instead.

Extract the contents of that package to a local directory, then perform the following steps:

  1. Copy the contents of the www/ subdirectory to your web server directory.

  2. Open your web browser and navigate to <cora>/db/configure_db.php, where <cora> is the URL of your web server directory. If your web server is set up correctly, this page will guide you through the database installation or upgrade process. (Alternatively, you can use the command-line script <cora>/db/configure_db_cli.php. Call it with -h to see the available options.)

  3. Log-in to your CorA instance. On a first-time installation, use the username "admin" with password "admin".


  • After the database installation, make sure to delete the db/ subdirectory from your web server! Anyone with access to this directory can potentially execute arbitrary commands on your server!

  • Make sure to change the default password of the "admin" account immediately after you login for the first time.

That's it!


The following people have directly contributed to the source code of this project:

Many thanks to all users who provided feedback on this software!

The development of this software was supported by Deutsche Forschungsgemeinschaft (DFG), Grants Nos. 1558/1-1/2 and 1558/5-1.