S4 is being discontinued

Please head to the Ontotext Cognitive Cloud to continue using our services

Ontotext Cognitive Cloud

The Cognitive Cloud is a direct continuation of S4 with improved stability and many new features. S4 will be discontinued on 20.12.2017

Do not worry, you can migrate your RDF data easily. You have already received or will shortly receive an email with migration instructions. Your data will be kept for a few months after the 20th, so if you missed the initial deadline, we can still arrange a migration for you.

The Cognitive Cloud, S4's successor service is much more stable and offers improved features and UI.

As always, for any questions, you can write to us.


S4 provides on demand access to text analytics, semantic graph databases and Linked Data technology in the cloud. You can start building Smart Data prototypes without the need for licensing, provisioning, installation and maintenance. Experiment more, experiment faster!


S4 is available at a fraction of the price of enterprise solutions. We offer tiered pricing based on the data volume processed by the text analytics services, or data volume managed by the graph database. You only pay for what you use and you can start at no cost with S4’s free tier.

Text Analytics

The S4 text analytics services can identify and extract entities from free flowing text and map them to reference entities in knowledge graphs. The services can also extract relationships between entities and categorise documents. Results are provided in JSON but can also be transformed into RDF and stored in the semantic graph database-as-a-service.


GraphDB™ is the semantic graph database (RDF triplestore) that powers S4. With GraphDB™ you can store, interlink and search entities extracted from the S4 text mining services, and create your private knowledge graphs integrating structured and unstructured data with facts from open knowledge graphs.

Knowledge Graphs

S4 provides access to popular open knowledge graphs / Linked Data such as DBpedia, Freebase/Wikidata and GeoNames. With Linked Data you can enhance your semantic analysis and provide users with important information about the entities extracted with text mining.


The text analytics services of S4 provide near real-time performance and can handle large volumes of documents of various types and formats. S4 also provides access to a highly scalable semantic graph database-as-a-service, which can accommodate your needs for large scale graph analytics and management.


What are you waiting for? Take a look and get results! Our documentation covers all you need to know to get an app up and running in minutes.


If you're having trouble using S4, want general advice, think you may have found a bug, or want to get in touch with a human being for any reason.