Best Knowledge Graph Software in 2026
Updated
In short: RDFox is ranked #1 of 33 as of 4 October 2026, ahead of AllegroGraph and GraphDB. The best-ranked option with a free plan is AllegroGraph. The lowest first paid tier on this page is TypeDB at $0.07/mo.
If your work depends on understanding how pieces of data relate, knowledge graph software offers features for representing and exploring those connections. Compare ontology modeling and graph visualization with import formats, deployment and query languages. RDF/SPARQL support and semantic reasoning are also part of the criteria, offering specific details to weigh for graph work. Free-plan availability and paid-from pricing provide cost points to consider. RDFox, AllegroGraph and GraphDB are among the options shown, with RDF Studio and Stardog also listed. Check which formats, modeling approaches and querying capabilities suit the data and workflows you need to handle.
33 knowledge graph software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
33ranked
15free plans on this page
$0.07/molowest paid tier
4 Oct 2026last checked
Input list Knowledge Graph Software 25 channels on this page · 122 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromOntology modelingSemantic reasoningRDF/SPARQL supportGraph visualizationImport formatsDeployment Spec sheet Score
01 RDFox Free planNoPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsN-Triples, Turtle, N-Quads, TriG, OWL 2 Functional-Style Syntax, DatalogDeploymentboth 7/8spec lines stated 7.9
02 AllegroGraph Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsJSON-LD, N-Quads, N-Triples, Extended N-Quads, RDF/XML, TriG, TriX, Turtle, JSON, JSONLines, CSVDeploymentboth 7/8spec lines stated 7.5
03 GraphDB Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsTurtle, Turtle-star, N-Triples, N-Quads, JSON-LD, NDJSON-LD, RDF/JSON, RDF/XML, TriX, TriG-star, BinaryRDFDeploymentboth 7/8spec lines stated 7.5
04 RDF Studio Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsTurtle, N-Triples, JSON-LD, CSV, Excel, JSON, ParquetDeploymentcloud 7/8spec lines stated 7.5
05 Stardog Free planYesPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 1/8spec lines stated 7.4
06 TypeDB Free planYesPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 1/8spec lines stated 7.4
07 Neo4j Free planYesPaid from$65/moOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 2/8spec lines stated 7.3
08 Protégé Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsRDF/XML, Turtle, OWL/XML, OBODeploymentboth 7/8spec lines stated 7.3
09 Virtuoso Universal Server Free plannot statedPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentboth 1/8spec lines stated 7.3
10 Apache Jena Fuseki Free plannot statedPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 0/8spec lines stated 7.1
11 Eclipse RDF4J Free plannot statedPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 0/8spec lines stated 7.1
12 LinkedDataHub Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningnot statedRDF/SPARQL supportYesGraph visualizationYesImport formatsCSV, RDFDeploymentboth 6/8spec lines stated 7.1
13 Progress Semaphore Free planNoPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsRDF, Excel spreadsheetsDeploymentboth 7/8spec lines stated 7.1
14 TerminusDB Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportNoGraph visualizationYesImport formatsCSV, JSON, JSON-LD, RDF/XML, TurtleDeploymentboth 7/8spec lines stated 7.1
15 Timbr Free planNoPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsOWL, CSVDeploymentboth 7/8spec lines stated 6.9
16 Mendix Free planYesPaid fromnot statedOntology modelingnot statedSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationnot statedImport formatsnot statedDeploymentnot stated 1/8spec lines stated 6.7
17 OWLGrEd Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningnot statedRDF/SPARQL supportnot statedGraph visualizationYesImport formats.owlDeploymentboth 5/8spec lines stated 6.5
18 Ontop Free plannot statedPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationnot statedImport formatsRDF/XML, Turtle, N-Triples, N-Quads, TriG, JSON-LD, R2RML, Ontop mapping formatDeploymentboth 5/8spec lines stated 6.3
19 HASH Free planYesPaid from$20/moOntology modelingYesSemantic reasoningYesRDF/SPARQL supportnot statedGraph visualizationYesImport formatsnot statedDeploymentboth 6/8spec lines stated 6.1
20 PoolParty Semantic Suite Free plannot statedPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsCSV, Excel, JSON, XML, relational tables, PDF, textDeploymentboth 6/8spec lines stated 6.1
21 Mondeca Free plannot statedPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsCSV, Excel, OWL, RDF, XML, SKOS, RDF/XML, N-Triples, Turtle, N3, JSON-LD, RDF/JSONDeploymentboth 6/8spec lines stated 6.0
22 d.AP Free plannot statedPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsRDF, OWL, TurtleDeploymentcloud 6/8spec lines stated 5.9
23 Fluent Editor Free planYesPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsnot statedDeploymentself hosted 6/8spec lines stated 5.9
24 metaphactory Free planNoPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatsExcelDeploymentboth 7/8spec lines stated 5.9
25 Ontotext Platform Free planNoPaid fromnot statedOntology modelingYesSemantic reasoningYesRDF/SPARQL supportYesGraph visualizationYesImport formatscsv, tsv, excel, json, xmlDeploymentself hosted 7/8spec lines stated 5.9
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Ontology modeling | Semantic reasoning |
|---|---|---|---|---|---|---|---|---|
| 1 | RDFox | 7.9 | Free plan | Free | No | — | Yes | Yes |
| 2 | AllegroGraph | 7.5 | Free plan | Free | Yes | — | Yes | Yes |
| 3 | GraphDB | 7.5 | Free plan | Free | Yes | — | Yes | Yes |
| 4 | RDF Studio | 7.5 | Free plan | Free | Yes | — | Yes | Yes |
| 5 | Stardog | 7.4 | Free plan | Free | Yes | — | — | — |
| 6 | TypeDB | 7.4 | Free plan | $0.07/mo | Yes | — | — | — |
| 7 | Neo4j | 7.3 | Free plan | $65/mo | Yes | 65 /mo | — | — |
| 8 | Protégé | 7.3 | Free plan | Free | Yes | — | Yes | Yes |
| 9 | Virtuoso Universal Server | 7.3 | No | — | — | — | — | — |
| 10 | Apache Jena Fuseki | 7.1 | Free plan | Free | — | — | — | — |
| 11 | Eclipse RDF4J | 7.1 | Free plan | Free | — | — | — | — |
| 12 | LinkedDataHub | 7.1 | Free plan | Free | Yes | — | Yes | — |
| 13 | Progress Semaphore | 7.1 | No | — | No | — | Yes | Yes |
| 14 | TerminusDB | 7.1 | Free plan | Free | Yes | — | Yes | Yes |
| 15 | Timbr | 6.9 | No | — | No | — | Yes | Yes |
| 16 | Mendix | 6.7 | Free plan | Free | Yes | — | — | — |
| 17 | OWLGrEd | 6.5 | Free plan | Free | Yes | — | Yes | — |
| 18 | Ontop | 6.3 | No | — | — | — | Yes | Yes |
| 19 | HASH | 6.1 | Free plan | $1.67/mo | Yes | 20 /mo | Yes | Yes |
| 20 | PoolParty Semantic Suite | 6.1 | No | — | — | — | Yes | Yes |
| 21 | Mondeca | 6.0 | No | — | — | — | Yes | Yes |
| 22 | d.AP | 5.9 | No | — | — | — | Yes | Yes |
| 23 | Fluent Editor | 5.9 | No | — | Yes | — | Yes | Yes |
| 24 | metaphactory | 5.9 | No | — | No | — | Yes | Yes |
| 25 | Ontotext Platform | 5.9 | No | — | No | — | Yes | Yes |
Is your tool 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 Specifiction?
RDFox is ranked #1 of 33 with a score of 7.9. AllegroGraph is second and GraphDB third.
How many of these have a free plan?
15 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, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing. Paid placements never change a rank.
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