Apache AGE
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.
At a glance
- Type
- PostgreSQL graph extension
- Tier
- T2
- Section
- Knowledge-graph platforms
- Created
- 2020
- Latest release
- not applicable — not OSS
- License
- not applicable — not OSS
- GitHub
- not applicable — no GitHub repo
- Pricing
- Free (Apache License 2.0 open-source extension)
- Funding
- no public funding
Taxonomy
- storage
- graph
- retrieval
- graph-traversal
- persistence
- long-term
- update
- overwrite
- unit
- fact
- governance
- inspectable
- conflict
- overwrite
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
Postgres extension that adds OpenCypher graph queries — KG without leaving Postgres.
Cons
Performance plateaus at large graph sizes; ecosystem of integrations smaller than Neo4j.
Claims & capabilities
Apache 2.0 licensed; openCypher on PostgreSQL; Apache top-level project 2023
Technical surface
- API surface
- SQL/Cypher via Postgres protocol
- Backend storage
- Postgres
- Deployment
- Self-hosted only (PostgreSQL extension; Azure Database for PostgreSQL ships it managed)
- Embedding model
- BYO
- Multi-tenancy
- namespace (Postgres)
- MCP
- no first-party MCP adapter published as of 2026-05; community connectors may exist.
- A2A
- not supported
- OpenTelemetry
- via Postgres OTel
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.
- AllegroGraph (Franz) T1
RDF triple/quad store with RDFS++ / OWL reasoning. v8.4 (May 2025) added an NLQ interface.
- ArangoDB T1
HybridGraphRAG combines vector search, graph traversal, full-text in one AQL query. ArangoGraphML for ML pipelines; LangChain integration.
- Dgraph T2
Vector indexing on any node. Google Gen AI Toolbox integration; LangChain agent orchestration.
- Diffbot T1
Auto-built knowledge graph from web crawl. 1T+ facts, 10B+ entities. GraphRAG-fine-tuned model based on open-source Llama 3.3.
Related systems
References (1)
- pgvector integrates with — openCypher over Postgres. Pairs with pgvector for graph + vector hybrid retrieval.