Catalog Categories Knowledge-graph platforms

Knowledge-graph platforms

17 systems in the knowledge-graph platforms category of the AI Agent Infrastructure Landscape, grouped by maturity tier.

Tier 1 — battle-tested (11)

  • AllegroGraph (Franz) RDF triple/quad store + reasoning

    RDF triple/quad store with RDFS++ / OWL reasoning. v8.4 (May 2025) added an NLQ interface.

  • Amazon Neptune Analytics Vector + graph in one managed service

    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.

  • ArangoDB Multi-model: graph + doc + KV + vector

    HybridGraphRAG combines vector search, graph traversal, full-text in one AQL query. ArangoGraphML for ML pipelines; LangChain integration.

  • Diffbot Auto-extracted KG from web crawl

    Auto-built knowledge graph from web crawl. 1T+ facts, 10B+ entities. GraphRAG-fine-tuned model based on open-source Llama 3.3.

  • Neo4j Property graph + vectors + Aura Agent

    Property graph DB with Cypher; native vector search; Aura Agent + MCP server for graph-as-memory. $100M GenAI investment in 2025.

  • Ontotext GraphDB / Graphwise RDF store + real-time inference

    RDF store with real-time inference. Ontotext merged with PoolParty in 2025 to form Graphwise.

  • Palantir Ontology Operational digital twin

    Proprietary operational ontology — semantic objects + kinetic actions wired to microservices. Not open-standards KG; closed platform.

  • PoolParty (now Graphwise) SKOS-based taxonomy + LLM advisor

    Taxonomy and knowledge organisation. Taxonomy Advisor (LLM-powered). SKOS-based.

  • Stardog RDF semantic platform + Voicebox AI

    RDF-native semantic platform with SHACL validation, virtual graphs, and the Voicebox AI assistant. $32.5M funding. Pitches itself as a governed-knowledge layer.

  • TigerGraph Massively parallel graph + GSQL

    Parallel graph DB with GSQL/GQL. CoPilot for entity extraction. Free community edition.

  • TopQuadrant (TopBraid EDG) Ontology-native governance

    Ontology-native semantic governance suite. SHACL + AI Copilots for taxonomy management.

Tier 2 — production-ready (6)

  • Apache AGE PostgreSQL graph extension

    openCypher over Postgres. Pairs with pgvector for graph + vector hybrid retrieval. Azure Database for PostgreSQL ships AGE with ai_extension LLM functions for entity extraction directly in SQL.

  • Dgraph Graph + vector + Hypermode cloud

    Vector indexing on any node. Google Gen AI Toolbox integration; LangChain agent orchestration.

  • FalkorDB GraphRAG-native, sub-140ms multi-hop

    Native GraphRAG SDK. Graph-memory backend for Mem0; MCP server via Graphiti integration; context graphs for long-term agent memory.

  • Kuzu Embedded graph DB + sub-3ms recall

    Embedded graph DB with built-in vector index + full-text search. MCP server packages for Claude (sub-3ms recall). Offline-first, single-file deployment. Community fork adds concurrent multi-writer support for multi-agent.

  • Memgraph In-memory GraphRAG + native vector search

    In-memory GraphRAG engine. Memgraph 3.0 adds native vector search alongside graph traversal. LangChain toolkit.

  • NebulaGraph Graph + vector + text hybrid retrieval

    v5.2 adds graph-vector-text hybrid retrieval natively. MCP server for Claude/GPT agents. GraphRAG in three lines of code.