Best Knowledge Graph Software in 2026
Updated
In short: AllegroGraph is ranked #1 of 33 as of 4 October 2026, ahead of RDFox and GraphDB. The best-ranked option with a free plan is RDFox. The lowest first paid tier on this page is TypeDB at $0.07/mo.
When your work depends on connected data, knowledge graph software can help represent and explore those relationships. Compare graph visualization and import formats with ontology modeling, then check deployment options, query languages, RDF/SPARQL support, and semantic reasoning. AllegroGraph, RDFox, and GraphDB are among the entries, alongside LinkedDataHub and TypeDB. Free-plan availability and paid-from pricing add practical points of comparison. Consider which listed formats, modeling approaches, and query capabilities align with your data and the ways your team needs to work with it.
33 knowledge graph software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Knowledge Graph Software, one module each. A lit port is something its maker publishes; 13 of the 25 on this page have a public API.
- 01 AllegroGraph API yesOSS not on recordFREE yesDOCS 7.4Free
- 02 RDFox API yesOSS not on recordFREE yesDOCS 7.4Free
- 03 GraphDB API yesOSS not on recordFREE yesDOCS 7.3Free
- 04 LinkedDataHub API yesOSS not on recordFREE yesDOCS 7.3Free
- 05 RDF Studio API yesOSS not on recordFREE yesDOCS 7.3Free
- 06 Stardog API yesOSS not on recordFREE yesDOCS 7.3Free
- 07 TerminusDB API yesOSS not on recordFREE yesDOCS 7.3Free
- 08 TypeDB API yesOSS not on recordFREE yesDOCS 7.3$0.07/mo
- 09 Apache Jena Fuseki API yesOSS not on recordFREE yesDOCS 7.2Free
- 10 Eclipse RDF4J API yesOSS not on recordFREE yesDOCS 7.2Free
- 11 Virtuoso Universal Server API yesOSS not on recordFREE not on recordDOCS 6.9
- 12 Progress Semaphore API yesOSS not on recordFREE not on recordDOCS 6.8
- 13 Timbr API yesOSS not on recordFREE not on recordDOCS 6.8
- 14 Neo4j API not on recordOSS not on recordFREE yesDOCS 6.0$65/mo
- 15 Mendix API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 16 Protégé API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 17 OWLGrEd API not on recordOSS not on recordFREE yesDOCS 5.6Free
- 18 d.AP API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 19 Fluent Editor API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 20 HASH API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 21 Mondeca API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 22 Ontop API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 23 PoolParty Semantic Suite API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 24 Synaptica API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 25 InfoLibrarian Knowledge Graph Engine API not on recordOSS not on recordFREE not on recordDOCS 5.1
Is your platform 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 Inferse?
AllegroGraph is ranked #1 of 33 with a score of 7.4. RDFox is second and GraphDB 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 on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.