LeanGraph

LeanGraph is a lightweight, embeddable graph database with full Cypher query support, powered by SQLite. Current stable version is 1.2.2, released under the MIT license with regular updates. It passes 100% of the openCypher TCK (2,684 scenarios, Neo4j 3.5 baseline), providing Cypher feature parity with Neo4j 3.5. Key differentiators include instant startup, ~50MB memory footprint, no Docker or JVM requirement, offline operation, and simple backup via file copy. Ideal for production graph workloads without infrastructure complexity, offering local, remote, and test modes. TypeScript types are shipped with the package.