Stardog
An RDF-based knowledge graph database with OWL 2 reasoning and property graph extensions. Includes Voicebox, an OpenAI-compatible natural language query interface via LLM integration.
- Overall rank
- #23
- First released
- 2011
- License
- Proprietary
- Built with
- Java
Sources 6 references
Protocols SPARQL Protocol, HTTP/REST
SNARL, Stardog's proprietary RPC-over-Protobuf wire protocol, was disabled in 4.2.4 and removed in 5.0, so pass_A's Native binary tag is stale for current versions. The Stardog HTTP Protocol extends the standard SPARQL 1.1 HTTP/Graph Store bindings with its own non-SPARQL resource endpoints, which justifies HTTP/REST alongside SPARQL Protocol (agreeing with pass_B).
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Stardog supports the SPARQL 1.1 HTTP Protocol; the SPARQL 1.1 Graph Store HTTP Protocol; and the Stardog HTTP Protocol.
HTTP API | Stardog Documentation Latest · reviewed 2026-08-02 -
In addition to the support for the standard protocols such as SPARQL 1.1, the Stardog HTTP protocol adds additional resource representations and capabilities.
HTTP API | Stardog Documentation Latest · reviewed 2026-08-02 -
The SNARL protocol is disabled in 4.2.4 and removed in 5.0.
Error trying to begin Transaction while trying gremlin on Stardog - Support · reviewed 2026-08-02
License Proprietary
Stardog's software license agreement licenses, rather than sells, the software under commercial terms; confirms current value.
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The Stardog software, modifications, enhancements, documentation, and license keys provided to Customer (Software) are licensed and are not sold.
Software License Agreement | Stardog · reviewed 2026-08-02
Released 2011
Clark & Parsia opened invite-only Stardog beta access in January 2011 and were still calling it 'forthcoming' at a March 2011 event, ahead of a May 2011 alpha and June 2012 1.0; confirms the current year-only value, though the exact month of first public availability is unclear.
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Stardog is a fast, lightweight RDF database. Today we’re announcing limited access to our beta testing program, in preparation for the 1.0 release.
Invitation to Stardog Beta - Stardog Blog Discussion - Stardog Community · reviewed 2026-08-02
Language Java
Stardog's creators (Clark & Parsia) describe it as a lightweight, pure Java implementation; confirms current value.
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Kendall Clark will present Stardog, the forthcoming commercial RDF database from C&P, featuring full OWL2 reasoning capabilities and fast query performance in a lightweight, pure Java implementation.
Stardog - Java event - developer Fusion · reviewed 2026-08-02