Best Knowledge Graph Software in 2026
Updated
In short: AllegroGraph is ranked #1 of 33 as of 4 October 2026, ahead of GraphDB and Neo4j. The best-ranked option with a free plan is GraphDB. The lowest first paid tier on this page is TypeDB at $0.07/mo.
When connected information is central to your work, knowledge graph tools offer different ways to model and query relationships between data. Compare deployment, graph visualization and import formats, then look at ontology modeling and the query languages each entry supports. RDF/SPARQL support and semantic reasoning are additional points to weigh, alongside free-plan availability and paid-from details. GraphDB, AllegroGraph and Stardog lead the ranking, with Eclipse RDF4J and Apache Jena Fuseki also among the first entries. Use the listed criteria to narrow the options by the formats you work with, how you want to explore a graph, and the modeling and query capabilities you need.
33 knowledge graph software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 AllegroGraph No phone app RecognisedPhone appDocumentedFree plan 6.4Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 2 GraphDB No phone app RecognisedPhone appDocumentedFree plan 6.4Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 3 Neo4j No phone app RecognisedPhone appDocumentedFree plan 6.4$65/mo
- 4 RDFox No phone app RecognisedPhone appDocumentedFree plan 6.4Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 5 LinkedDataHub No phone app RecognisedPhone appDocumentedFree plan 6.3Free Ontology modeling: YesRDF/SPARQL support: Yes
- 6 Mendix No phone app RecognisedPhone appDocumentedFree plan 6.3Free
- 7 Protégé No phone app RecognisedPhone appDocumentedFree plan 6.3Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 8 RDF Studio No phone app RecognisedPhone appDocumentedFree plan 6.3Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 9 Stardog No phone app RecognisedPhone appDocumentedFree plan 6.3Free
- 10 TerminusDB No phone app RecognisedPhone appDocumentedFree plan 6.3Free Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: No
- 11 TypeDB No phone app RecognisedPhone appDocumentedFree plan 6.3$0.07/mo
- 12 Apache Jena Fuseki No phone app RecognisedPhone appDocumentedFree plan 6.2Free
- 13 Eclipse RDF4J No phone app RecognisedPhone appDocumentedFree plan 6.2Free
- 14 OWLGrEd No phone app RecognisedPhone appDocumentedFree plan 6.0Free Ontology modeling: Yes
- 15 Virtuoso Universal Server No phone app RecognisedPhone appDocumentedFree plan 5.7
- 16 Progress Semaphore No phone app RecognisedPhone appDocumentedFree plan 5.6 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 17 d.AP No phone app RecognisedPhone appDocumentedFree plan 5.5 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 18 HASH No phone app RecognisedPhone appDocumentedFree plan 5.5 Ontology modeling: YesSemantic reasoning: Yes
- 19 PoolParty Semantic Suite No phone app RecognisedPhone appDocumentedFree plan 5.5 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 20 Fluent Editor No phone app RecognisedPhone appDocumentedFree plan 5.4 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 21 Mondeca No phone app RecognisedPhone appDocumentedFree plan 5.4 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 22 Ontop No phone app RecognisedPhone appDocumentedFree plan 5.4 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 23 Synaptica No phone app RecognisedPhone appDocumentedFree plan 5.4 Ontology modeling: YesSemantic reasoning: YesRDF/SPARQL support: Yes
- 24 InfoLibrarian Knowledge Graph Engine No phone app RecognisedPhone appDocumentedFree plan 5.3 Ontology modeling: YesSemantic reasoning: Yes
- 25 Qlevia Enterprise RDF Graph Platform No phone app RecognisedPhone appDocumentedFree plan 5.3 Semantic reasoning: YesRDF/SPARQL support: Yes
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which knowledge graph software is ranked first on Samsung Mobile US Press?
AllegroGraph is ranked #1 of 33 with a score of 6.4. GraphDB is second and Neo4j third.
How many of these have a free plan?
14 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, TypeDB has the lowest first paid tier we found: $0.07/mo.
How is this list ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.