Stardog
RDF-native semantic platform with SHACL validation, virtual graphs, and the Voicebox AI assistant. $32.5M funding. Pitches itself as a governed-knowledge layer.
Active · Verified 2026-10-27 · fresh as of 2026-10-27 · 48 cited facts, 1 with a third-party source · 1 recorded change · Suggest a correction
At a glance
- Type
- RDF semantic platform + Voicebox AI vendor fix
- Tier
- T1
- Section
- Knowledge-graph platforms
- Latest release
- not applicable — not OSS fix
- License
- not applicable — not OSS fix
- GitHub
- not applicable — no GitHub repo fix
- Pricing
- Stardog Free (renewable 1-year license, commercial use allowed, no HA/caching/backups); Enterprise on-prem and cloud quote-based vendor fix
- Funding
- $32M Series C (last known) · 2022-01 vendor fix
- Freshness
- 2026-10-27 fix
- Layer
- model-infra repo fix
- Licensing
- commercial vendor fix
- SDK languages
- java, python, rest, typescript vendor fix
- Protocols
- mcp-server repo fix
When to use
Optimised for: relationship modeling + reasoning + governance over pure vector
Anti-fit: not for purely-vector or simple-RAG use cases (graph adds setup cost)
Pros & cons
Pros
Mature semantic graph + virtualization (data fabric over relational/cloud sources); strong inference rules engine.
Cons
Enterprise-tier pricing and complexity; smaller community than Neo4j; license shifted to Stardog Studio commercial focus.
Claims & capabilities
$32.5M total funding (Series C; 2022); customers include Boehringer Ingelheim, Schneider Electric, NASA, U.S. Department of Defense; Voicebox AI launched 2024 — early access "to dozens of existing customers and new prospects" in manufacturing/pharma; Helix Finance case study reports 40% reduction in regulatory review cycles. Accenture Ventures strategic investment 2025
Technical surface
- API surface
- REST, SPARQL, SDK: Java, Python, JS
- Backend storage
- custom (RDF triple store)
- Deployment
- Both
- Embedding model
- BYO
- Multi-tenancy
- Per-database access control; on-prem / private-cloud / SaaS options
- MCP
- yes — official Stardog Cloud MCP server (stardog-union/stardog-cloud-mcp; remote setup in beta)
- A2A
- no Google A2A (Agent2Agent) integration documented as of 2026-05.
- OpenTelemetry
- first-class — Prometheus + OTel
Compare Stardog with…
Alternatives to Stardog → live options ranked by shared design, licence, hosting and MCP support
Similar systems
Other knowledge-graph platforms in the catalog, ranked by inbound references.
- Neo4j T1
Property graph DB with Cypher; native vector search; Aura Agent + MCP server for graph-as-memory. $100M GenAI investment in 2025.
- Amazon Neptune Analytics T1
Vector index on graph nodes queryable via openCypher. Mem0 integration GA 2025; Cognee integration for agentic RAG. Combines semantic recall with multi-hop traversal in one managed service.
- FalkorDB T2
Native GraphRAG SDK. Graph-memory backend for Mem0; MCP server via Graphiti integration; context graphs for long-term agent memory.
- ArangoDB T1
HybridGraphRAG combines vector search, graph traversal, full-text in one AQL query. ArangoGraphML for ML pipelines; LangChain integration. The company now brands itself Arango (Arango Contextual Data Platform unifying graph, vector, document and search), with ArangoDB as its database.
- Kuzu T2
Embedded property-graph database (Cypher) with a built-in vector index and full-text search, widely used as an embedded store for agent memory and GraphRAG. The kuzudb/kuzu repository was archived on 2025-10-10 after Apple acquired the company; 0.11.3 is the final release and earlier releases remain usable.
- Memgraph T2
In-memory GraphRAG engine. Memgraph 3.0 adds native vector search alongside graph traversal. LangChain toolkit.
Sources (47 cited facts, 1 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is RDF semantic platform + Voicebox AI vendor
- What it does & what's distinct RDF-native semantic platform with SHACL validation, virtual graphs, and the Voicebox AI … vendor
- Claims / benefits $32.5M total funding (Series C; 2022); customers include Boehringer Ingelheim, Schneider… vendor
- Modalities text vendor
- Created 2010 third-party
- Mindshare 1 press ~100 (Stardog L jobs vendor
- Funding $32M Series C (last known) · 2022-01 vendor
- Customers / scale 51-200 ppl Fortune 500 enterprises, pharma financial services government vendor
- Pricing Stardog Free (renewable 1-year license, commercial use allowed, no HA/caching/backups); … vendor
- Compliance SOC 2 Type II vendor
- Data handling Does not sell customer data; grants data rights only for product operation and maintenance vendor
- Deployment Both vendor
- HQ US vendor
- Founders / pedigree Kendall Clark (CEO/co-founder), Michael Grove, Evren Sirin vendor
- Memory volume / scale no scale claim vendor
- Performance No public ANN-Benchmarks entry; vendor reports 95% accuracy on knowledge-grounded answer… vendor
- API surface REST, SPARQL, SDK: Java, Python, JS vendor
- Backend storage custom (RDF triple store) vendor
- Multi-tenancy Per-database access control; on-prem / private-cloud / SaaS options vendor
- Encryption AES-256 at rest, TLS in transit; SOC 2 Type II; FIPS-aligned vendor
- SSO / RBAC SSO + RBAC vendor
- Embedding model BYO vendor
- Versioning immutable append-log vendor
- Tombstoning soft-delete only vendor
- Schema evolution schema with migration vendor
- Namespace primitives per-tenant vendor
- Contradiction handling always overwrite (last-write-wins) vendor
- Forgetting policy none (permanent) vendor
- MCP support yes — official Stardog Cloud MCP server (stardog-union/stardog-cloud-mcp; remote setup i… repo
- OTel first-class — Prometheus + OTel vendor
- Import / export RDF (Turtle/N-Triples), JSON-LD, CSV vendor
- Validated verticals financial-services, healthcare, legal, government, internal IT, KM vendor
- Time to running <1hr (Docker / managed cloud) to <1week (enterprise procurement) vendor
- Anti-fit not for purely-vector or simple-RAG use cases (graph adds setup cost) vendor
- Optimised for relationship modeling + reasoning + governance over pure vector vendor
- Adjacent infrastructure BYO LLM; bundled graph store; some require additional vector index vendor
- Pros Mature semantic graph + virtualization (data fabric over relational/cloud sources); stro… vendor
- Cons Enterprise-tier pricing and complexity; smaller community than Neo4j; license shifted to… vendor
- Project & sources stardog.com Voicebox vendor
- cost-pricing-model subscription vendor
- cost-last-verified 2026-06-29 vendor
- architecture-deployment-locus hybrid vendor
- licensing-bucket commercial vendor
- positioning-platform-vs-product platform vendor
- taxonomy-three-layer-rollup model-infra repo
- sdk-languages java,python,rest,typescript vendor
- protocol-support mcp-server repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)
- 2026-10-27
- Pricing “Enterprise only” → “Stardog Free (renewable 1-year license, commercial use allowed, no HA/caching/backups); Enterprise on-prem and cloud quote-based” source
- MCP support first recorded as “yes — official Stardog Cloud MCP server (stardog-union/stardog-cloud-mcp; remote setup in beta)” source
Related systems
Referenced by (1)
- LangChain (framework) integrates with — LangChain's all-providers integrations page lists Stardog: "Enterprise knowledge graph platform". (verified 2026-10-29)