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OpenCalais is the Open Source repository for the Calais project.


"Calais: Connect. Everything." [1]

Mission Statement

We want to make all the world's content more accessible, interoperable and valuable. Some call it Web 2.0, Web 3.0, the Semantic Web or the Giant Global Graph - we call our piece of it Calais.

Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, content management system, website or application.



The free Calais Web service that has an open API. Users of the service can request 40,000 content transactions per day and a limit of 4 per second. Information and resources can be found at

Calais Professional

Is the same service as OpenCalais, but provides more transactions and 24×7 monitoring. The daily transaction count is increased to a maximum of 100,000 and a limit of 20 per second. Additional transactions can also be purchased.

Calais Professional for Publishers

Is the professional option for large scale publishers. It also has an option to purchase the service as an annual contract.

Calais Enterprise

Is the “enterprise software” version of Calais. Enterprises can install a customized version of Calais within the enterprise’s IT infrastructure. In addition to the functionality provided by the above options, enterprise users can create their own entities and relations in order to add information to the metadata that is generated by Calais.


External Links


  1. OpenCalais Home:
  2. Reuters Leading the Semantic Web Charge: