The Best Knowledge Graph Software in 2026
We researched knowledge graph software from official websites, including pricing pages, plan tables, and product documentation. Products are ranked on their core job of modeling and connecting knowledge, value for money, and verified features such as reasoning, standards support, deployment, and data ingestion.
Our top picks
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Top ranked
Neo4j#1 of 339.3/10A developer-focused property graph with broad tooling, cloud options, and AI-ready search.
Free plan · 14-day trial
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Runner-up
Protégé#2 of 339.1/10A strong free choice for OWL ontology work, with collaboration and reasoning options.
Free plan
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Top-ranked free plan
Stardog#5 of 338.8/10A flexible choice for federating enterprise data across cloud, databases, and APIs.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 33 tools, best first
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Best forProperty-graph applications with strong developer tooling
A developer-focused property graph with broad tooling, cloud options, and AI-ready search.
Free plan · 14-day trial Our Neo4j verdict → Visit Neo4jFor vendors Sponsor this spot · #1 · $149/mo →9.3/10★★★★★Visit Neo4j -
Best forOntology engineers and collaborative OWL modeling
A strong free choice for OWL ontology work, with collaboration and reasoning options.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
9.1/10★★★★★Visit Protégé -
Best forMature ontology and semantic-classification teams
A mature platform for ontology management, semantic enrichment, and enterprise knowledge graphs.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
Pricing on request · 30-day trial Our Progress Semaphore verdict → Visit siteFor vendors Sponsor this spot · #3 · $79/mo →9.0/10★★★★☆Visit site -
Best forOpen-source teams building self-hosted RDF services
An open-source RDF server with strong SPARQL, inference, federation, and deployment options.
8.9/10★★★★☆Visit Fuseki -
Best forFederated knowledge graphs across enterprise data
A flexible choice for federating enterprise data across cloud, databases, and APIs.
8.8/10★★★★☆Visit Stardog -
Best forEnterprise semantic graphs with advanced operations
A mature graph database combining semantic reasoning, operations, visualization, and AI features.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
8.6/10★★★★☆Visit AllegroGraph -
Best forEnterprise taxonomies, search, and semantic enrichment
A wide-ranging semantic platform for enterprise search, enrichment, and knowledge management.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
8.3/10★★★★☆Visit PoolParty -
Best forMature hybrid SQL and RDF deployments
A broad open-source platform for teams combining relational and RDF workloads.
8.1/10★★★★☆Visit OpenLink -
Best forGraphQL-facing semantic data platforms
A broad semantic data platform for teams delivering GraphQL-facing knowledge graph services.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
8.0/10★★★★☆Visit Ontotext -
Best forTeams embedding graphs in business applications
A broad low-code app platform for embedding graph-backed capabilities in business software.
7.9/10★★★★☆Visit Mendix -
Best forTeams needing a full-featured RDF knowledge graph
A capable RDF knowledge graph database with free access and enterprise scaling.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
7.9/10★★★★☆Visit GraphDB -
Best forOpen-source RDF developers needing federation
An open-source Java framework for building, querying, validating, and serving RDF systems.
7.9/10★★★★☆Visit Eclipse RDF4J -
Best forOpen-source SPARQL search and federation
A focused open-source choice for SPARQL 1.1, federation, and RDF search.
7.9/10★★★★☆Visit QLever -
Best forPaid semantic virtualization with extensive BI access
A broad semantic virtualization platform for governed BI and AI access.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
7.8/10★★★★☆Visit Timbr -
Best forVirtual knowledge graphs over relational databases
An open-source layer for querying relational data as RDF knowledge graphs.
- RDF/SPARQL support
- Semantic reasoning
- Ontology modeling
7.7/10★★★★☆Visit Ontop -
Best forTyped transactional graphs with a low-cost start
A low-cost typed graph database for transactional, interconnected data.
7.6/10★★★★☆Visit TypeDB -
Best forEnterprise knowledge-graph integration and governance
A broad enterprise graph platform for semantic integration, governance, and querying.
7.5/10★★★★☆Visit eccenca -
Best forLarge-scale ontology and semantic-content programs
A broad enterprise suite for modeling, enriching, governing and publishing knowledge graphs.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
7.4/10★★★★☆Visit Mondeca -
Best forCollaborative AI-assisted knowledge graph building
A broad, AI-assisted graph workspace for teams turning scattered information into structured context.
- Semantic reasoning
- Graph visualization
- Ontology modeling
7.3/10★★★★☆Visit HASH -
Best forVisual enterprise graph exploration and modeling
A broad enterprise graph platform for modeling, discovery, federation, and semantic applications.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
7.2/10★★★★☆Visit metaphactory -
Best forTeams needing fast rule-based RDF reasoning
A focused RDF platform for teams that need rule-based reasoning and SPARQL.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
7.1/10★★★★☆Visit RDFox -
Best forMinimal open-source RDF and SPARQL infrastructure
A focused open-source foundation for RDF storage, SPARQL, and linked-data applications.
- RDF/SPARQL support
7.0/10★★★★☆Visit Oxigraph -
Best forVersioned open-source document graphs
A versioned, schema-enforced graph database with broad data formats but no SPARQL.
- Semantic reasoning
- Graph visualization
- Ontology modeling
6.9/10★★★☆☆Visit TerminusDB -
Best forTeams curating structured data together
A collaborative, open-source knowledge base for structured data, RDF and SPARQL.
- RDF/SPARQL support
- Ontology modeling
6.8/10★★★☆☆Visit Wikibase -
Best forFree open-source RDF apps and knowledge graphs
A focused open-source toolkit for managing, querying, and building on RDF data.
- RDF/SPARQL support
- Graph visualization
- Ontology modeling
6.7/10★★★☆☆Visit LinkedDataHub -
Best forFree users wanting an integrated RDF workbench
A free RDF workbench that brings querying, ontology design, validation, and visualization together.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
6.5/10★★★☆☆Visit RDF Studio -
Best forOntology authors preferring controlled-English editing
A focused, free ontology editor for Windows users who prefer controlled-English authoring.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
6.4/10★★★☆☆Visit Cognitum -
Best forUsers who mainly need visual OWL editing
Free OWL editing and diagram tools for ontology work centered on visual structure.
- Graph visualization
- Ontology modeling
6.3/10★★★☆☆Visit OWLGrEd -
Best forAI-assisted multimodal graph construction
A broad, licensed engine for building traceable multimodal knowledge graphs.
- Semantic reasoning
- Ontology modeling
6.1/10★★★☆☆Visit InfoLibrarian -
Best forGoverned taxonomy and semantic-schema programs
A governed knowledge graph platform for teams building semantic schemas at enterprise scale.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
6.0/10★★★☆☆Visit Synaptica -
Best forCloud ontology graphs with AI-assisted querying
A capable cloud ontology graph for enterprises that need semantic context and AI access.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
5.9/10★★★☆☆Visit d.AP -
Best forEnterprises building managed RDF graphs on Azure
A managed Azure RDF platform for enterprises building SPARQL-based graph applications.
- RDF/SPARQL support
- Semantic reasoning
- Graph visualization
5.8/10★★★☆☆Visit Qlevia -
Best forBiomedical knowledge-graph question answering
A focused research service for multi-hop biomedical questions and graph exploration.
- Semantic reasoning
- Graph visualization
5.7/10★★★☆☆Visit ROBOKOP
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Ontology modeling | Semantic reasoning | RDF/SPARQL support | Deployment | Score |
|---|---|---|---|---|---|---|---|---|
| 1 | Neo4j | Yes | 9.3 | |||||
| 2 | Protégé | Yes | Free | Yes | Yes | Yes | Both | 9.1 |
| 3 | Progress Semaphore | No | Yes | Yes | Yes | Both | 9.0 | |
| 4 | Apache Jena Fuseki | Free | 8.9 | |||||
| 5 | Stardog | Yes | 8.8 | |||||
| 6 | AllegroGraph | Yes | Yes | Yes | Yes | Both | 8.6 | |
| 7 | PoolParty Semantic Suite | Yes | Yes | Yes | Both | 8.3 | ||
| 8 | OpenLink Virtuoso | Free | Both | 8.1 | ||||
| 9 | Ontotext Platform | No | Yes | Yes | Yes | Self_hosted | 8.0 | |
| 10 | Mendix | Yes | 7.9 | |||||
| 11 | GraphDB | Yes | Yes | Yes | Yes | Both | 7.9 | |
| 12 | Eclipse RDF4J | Free | 7.9 | |||||
| 13 | QLever | Free | 7.9 | |||||
| 14 | Timbr | No | Yes | Yes | Yes | Both | 7.8 | |
| 15 | Ontop | Free | Yes | Yes | Yes | Both | 7.7 | |
| 16 | TypeDB | Yes | $0.07/unit usage-based | 7.6 | ||||
| 17 | eccenca Corporate Memory | 7.5 | ||||||
| 18 | Mondeca | Yes | Yes | Yes | Both | 7.4 | ||
| 19 | HASH | Yes | $20/mo | Yes | Yes | Both | 7.3 | |
| 20 | metaphactory | No | Yes | Yes | Yes | Both | 7.2 | |
| 21 | RDFox | No | Yes | Yes | Yes | Both | 7.1 | |
| 22 | Oxigraph | Free | Yes | Both | 7.0 | |||
| 23 | TerminusDB | Yes | Free | Yes | Yes | No | Both | 6.9 |
| 24 | Wikibase | Yes | Free | Yes | Yes | Both | 6.8 | |
| 25 | LinkedDataHub | Yes | Free | Yes | Yes | Both | 6.7 | |
| 26 | RDF Studio | Yes | Free | Yes | Yes | Yes | Cloud | 6.5 |
| 27 | Fluent Editor | Yes | Free | Yes | Yes | Yes | Self_hosted | 6.4 |
| 28 | OWLGrEd | Yes | Free | Yes | Both | 6.3 | ||
| 29 | InfoLibrarian Knowledge Graph Engine | Yes | Yes | Both | 6.1 | |||
| 30 | Synaptica | Yes | Yes | Yes | 6.0 | |||
| 31 | d.AP | Yes | Yes | Yes | Cloud | 5.9 | ||
| 32 | Qlevia Enterprise RDF Graph Platform | Yes | Yes | Cloud | 5.8 | |||
| 33 | ROBOKOP | Free | No | Yes | Cloud | 5.7 |
Head-to-head All 25 comparisons →
- Neo4j vs Protégé
- Neo4j vs Progress Semaphore
- Neo4j vs Apache Jena Fuseki
- Neo4j vs Stardog
- Neo4j vs AllegroGraph
- Neo4j vs PoolParty Semantic Suite
- Neo4j vs OpenLink Virtuoso
- Protégé vs Progress Semaphore
- Protégé vs Apache Jena Fuseki
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How we rank knowledge graph software
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update