Cayley

Web · Mac · Linux · Self-hosted · API

Freedom report

Three barsScore 6.5

Cayley is ranked #10 of 37 in graph databases on Freedom251. It runs on API, Linux, macOS, Self-hosted, Web. There is a free plan.

Cayley plans and pricing

Open-source CayleyGraph Free Free to use in any project · Apache 2.0 license cayley.io · 4 Oct 2026

What it does: Cayley is an open-source graph database inspired by the graph database behind Freebase and Google's Knowledge Graph.
Linked data: Cayley supports RDF and linked data formats including NQuads and JSON-LD.
Storage: Cayley works on top of SQL, NoSQL, or key-value databases.
Extensibility: Cayley can be extended with new formats, backends, query languages, or custom logic.
License: Cayley is developed under the Apache 2.0 license and is free to use in any project.
Query tools: Cayley includes a query editor, visualizer, and REPL.
Installation: The installation guide gives instructions for Ubuntu via Snap, macOS via Homebrew, Docker, and building from source.
Database integrations: The configuration guide lists LevelDB, Bolt, MongoDB, Elasticsearch, CouchDB, PouchDB, PostgreSQL, CockroachDB, MySQL, MariaDB, and SQLite backends.
Data size guidance: The guide says the default in-memory store is best for datasets that fit in machine memory and workloads that do not require persistence; it recommends Bolt for large datasets or persistent workloads.
API: Cayley's documentation describes HTTP query endpoints for Gizmo, GraphQL, and MQL.
Visualization: The UI overview says the visualizer can display query results as a graph when results are tagged with source and target.
Support and community: The project invites users to join its community on Slack or Discourse.
Price from: Free

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