Neo4j is a graph database management system developed by Neo4j, Inc. Described by its developers as an ACID-compliant transactional database with native graph storage and processing, Neo4j is the most popular graph database according to DB-Engines ranking, and the 22nd most popular database overall.
Neo4j is available in a GPL3-licensed open-source "community edition", with online backup and high availability extensions licensed under the terms of the Affero General Public License. Neo also licenses Neo4j with these extensions under closed-source commercial terms.
Neo4j is implemented in Java and accessible from software written in other languages using the Cypher Query Language through a transactional HTTP endpoint, or through the binary "bolt" protocol.
Version 1.0 was released in February 2010.
Neo4j version 2.0 was released in December 2013.
Neo4j version 3.0 was released in April 2016.
In November 2016 Neo4j successfully secured $36M in Series D Funding led by Greenbridge Partners Ltd
Licensing and editions
Neo4j comes in 2 editions: Community; Enterprise. It is dual-licensed: GPLv3; and AGPLv3 / commercial. The Community Edition is free but is limited to running on 1 node only due to the lack of clustering and is without hot backups.
The enterprise edition unlocks these limitations, allowing for clustering, hot backups, and monitoring. The Enterprise Edition is available under a dual-licensed model: AGPLv3 and Commercial. If you have not executed a Commercial Agreement with Neo4j Inc or one of its affiliates, then Neo4j Enterprise falls back to the open source GNU AFFERO GENERAL PUBLIC LICENSE Version 3.
In Neo4j, everything is stored in the form of either an edge, a node, or an attribute. Each node and edge can have any number of attributes. Both the nodes and edges can be labelled. Labels can be used to narrow searches. As of version 2.0, indexing was added to Cypher with the introduction of schemas. Previously, indexes were supported separately from Cypher.
Neo4j is developed by Neo4j, Inc., based in the San Francisco Bay Area, United States, North America, and also in Malmö, Sweden, Europe. The Neo4j, Inc. board of directors consists of Rod Johnson (founder of the Spring Framework), Chris Barchak (Partner at Conor Venture Partners), Magnus Christerson (Vice President of Intentional Software Corp), Nikolaj Nyholm (Partner at Sunstone Capital), Guarav Tuli (Principal at Fidelity Growth Partners), and Johan Svensson (CTO of Neo4j Inc).
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