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Best Knowledge Graph Software 2026
When your work depends on connections between data, knowledge graph software can help model and explore those relationships. Compared on ontology modeling, graph visualization, and import formats, these entries offer criteria for assessing how data can be represented and brought in. Review deployment choices, query languages, RDF/SPARQL support, and semantic reasoning to see which listed capabilities fit your intended workflows. Free-plan availability and paid-from pricing provide cost context alongside the technical details. AllegroGraph, GraphDB, and Neo4j are among the named options, with RDFox and LinkedDataHub also represented. Consider the formats, modeling approaches, and query methods you expect to use when comparing the available software.
02
Mendix
Free is suited to exploring Mendix, prototyping, or building small personal applications.
AndroidiPhone & iPadWeb+4 Record6.0 Visit
03
Stardog
AndroidiPhone & iPadWeb+5 Record6.0 Visit
04
AllegroGraph
AllegroGraph suits teams building Knowledge Graphs or applying semantic data to areas such as pharma discovery, healthcare, Customer 360, and supply-chain logistics.
WebWindowsMac+3 Record5.6 Visit
05
LinkedDataHub
LinkedDataHub may fit researchers, data scientists, developers, data publishers, and builders of AI agents who work with RDF data.
WebWindowsMac+3 Record5.6 Visit
6
Apache Jena Fuseki
WebWindowsLinux+2 Free plan Record5.4 Visit It suits teams building semantic web or linked data applications that need a self-hosted SPARQL service.
7
Eclipse RDF4J
WebWindowsMac+3 Free plan Record5.3 Visit RDF4J suits Java developers building applications with RDF, Linked Data, SPARQL endpoints, or Semantic Web data.
8
Protégé
WebWindowsMac+3 Free plan Record5.3 Visit Protégé suits researchers and other users building or managing ontologies, whether they prefer desktop tools or browser-based collaboration.
9
RDFox
WebWindowsMac+3 — Record5.2 Visit RDFox suits teams building or operating RDF knowledge graphs that need SPARQL querying and rule-based reasoning.
10
Neo4j
Self-hosted $65 a month Record5.1 Visit Neo4j suits developers and organizations working with connected data who need graph querying and deployment choices.
11
TypeDB
WebWindowsMac+3 $0.07 usage-based Record5.1 Visit TypeDB may suit developers and organizations working with connected data for knowledge graphs, robotics, financial intelligence, or other listed use cases.
12
HASH
WebBrowser extensionAPI+1 $20 a month, billed yearly Record5.0 Visit HASH suits organizations seeking a graph-based model to support analytics, workflow automation, simulations, or AI agents.
13
QLever
WebWindowsMac+3 Free plan Record5.0 Visit QLever suits developers and teams working with large RDF datasets who need SPARQL querying, text search, or spatial features.
14
GraphDB
WebWindowsMac+3 Free plan Record4.9 Visit GraphDB may suit teams connecting business data for semantic querying and AI applications.
15
RDF Studio
WebWindowsMac+2 Free plan Record4.9 Visit RDF Studio is aimed at ontologists, data engineers, data analysts, knowledge graph engineers, and technical leaders.
16
Ontop
WebWindowsMac+3 Free plan Record4.8 Visit Ontop suits teams that need ontology modeling, semantic reasoning, and SPARQL over relational databases.
17
Oxigraph
WebLinuxAPI+1 Free plan Record4.7 Visit Oxigraph suits developers building RDF and SPARQL applications, especially Rust projects that can reuse its library or standalone crates.
19
TerminusDB
WebLinuxAPI+1 Free plan Record4.5 Visit It suits developers and data engineers handling auditable lineage, complex domain models, collaborative workflows, or changing structured content.
22
Progress Semaphore
WebWindowsLinux+2 — Record4.2 Visit Semaphore is aimed at organizations building governed generative-AI applications, enterprise search, document Q&A, or semantic data workflows.
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