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Tech riderRev. 4 Oct 2026

Cayley

Ch 137.1of 37 Graph Databases
  1. 1Runs onAPI, Linux, Mac, self-hosted, Web
  2. 2CostsFree plan
  3. 3Deploymentself hosted
  4. 4Query languagesGizmo, MQL, GraphQL dialect
4 lines stated Written from the maker's own pages: cayley.io
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The Cayley homepage

Overview

Cayley is ranked #13 of 37 in graph databases on Specifiction. It runs on API, Linux, macOS, Self-hosted, Web. There is a free plan.

Cayley plans and pricing

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

Compared on graph databases

Deployment
self_hostedcayley.io
Query languages
Gizmo, MQL, GraphQL dialectcayley.io

Facts

What it does
Cayley is an open-source graph database inspired by the graph database behind Freebase and Google's Knowledge Graph.cayley.io · 4 Oct 2026
Linked data
Cayley supports RDF and linked data formats including NQuads and JSON-LD.cayley.io · 4 Oct 2026
Storage
Cayley works on top of SQL, NoSQL, or key-value databases.cayley.io · 4 Oct 2026
Extensibility
Cayley can be extended with new formats, backends, query languages, or custom logic.cayley.io · 4 Oct 2026
License
Cayley is developed under the Apache 2.0 license and is free to use in any project.cayley.io · 4 Oct 2026
Query tools
Cayley includes a query editor, visualizer, and REPL.github.com · 4 Oct 2026
Installation
The installation guide gives instructions for Ubuntu via Snap, macOS via Homebrew, Docker, and building from source.cayley.gitbook.io · 4 Oct 2026
Database integrations
The configuration guide lists LevelDB, Bolt, MongoDB, Elasticsearch, CouchDB, PouchDB, PostgreSQL, CockroachDB, MySQL, MariaDB, and SQLite backends.cayley.gitbook.io · 4 Oct 2026
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.cayley.gitbook.io · 4 Oct 2026
API
Cayley's documentation describes HTTP query endpoints for Gizmo, GraphQL, and MQL.cayley.gitbook.io · 4 Oct 2026
Visualization
The UI overview says the visualizer can display query results as a graph when results are tagged with source and target.cayley.gitbook.io · 4 Oct 2026
Support and community
The project invites users to join its community on Slack or Discourse.cayley.io · 4 Oct 2026

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Where it ranks on Specifiction

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Sources