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Ontotext AD
Private S.A.

Semantic Web
Semantic technology
Open Data
Linked Data
Text mining
Information discovery

Knowledge Engineering
Founded 2000
Headquarters Sofia, Bulgaria
Key people
Atanas Kiryakov, CEO

GraphDB, Ontotext Semantic Platform , Self-Service Semantic Suite (S4) , Media & Publishing solutions, Life Sciences & Healthcare solutions, Compliance & Document Management solutions, solutions for Galleries, Libraries, Archives & Museums (GLAM),

Fact Forge,

Linked Life Data
Number of employees
Website Ontotext web site

Ontotext is a Bulgarian software company headquartered in Sofia. It is the semantic technology branch of Sirma Group. Its main domain of activity is the development of software products and solutions based on the Semantic Web languages and standards, in particular RDF, OWL and SPARQL.


Research projects[edit]

The company has been involved in over 30 research projects in the European Framework Programmes in the domains of Semantic Web, Linked Data,Open Data and Text mining

Commercial products[edit]

  • GraphDB (formerly OWLIM) - a leading RDF triplestore available in three versions - Lite, Standard and Enterprise
  • The Self-Service Semantic Suite (S4); a cloud-based semantic metadata management and text analytics software as a service
  • Ontotext Semantic Publishing Platform; providing an enrichment suite for text mining and semantic annotation, data integration tools to transform your data into RDF and tools for semantic curation allowing users to search the knowledge base and curate content at the same time

External links[edit]