Neo4j AuraDB meters both compute and storage in GB-hours tied to provisioned RAM, so a knowledge graph that outgrows the free tier's roughly 200,000-node cap moves straight into per-GB-month billing starting at $65 on Professional and $146 on Business Critical. Business Critical is also the only tier that unlocks role-based access control and a 99.95% uptime SLA, so teams needing basic access controls on a production graph get pushed onto the most expensive pricing bracket regardless of actual dataset size. Apache AGE turns an existing PostgreSQL instance into a full openCypher-and-SQL graph engine, so relational joins and graph traversals run in the same query and the same ACID transaction without a separate hosted service or GB-hour meter. ArcadeDB and JanusGraph go further, exposing raw configuration for Bolt-protocol compatibility, pluggable storage backends like Cassandra or HBase, and leader-follower replication inside your own Docker Compose or Kubernetes topology — clustering Neo4j itself reserves for its paid Enterprise edition.
| Name | Main Category | Sub-Category | Target Alternative | Free Tier Summary | Self-Hostable? | Short Description | Primary Link |
|---|---|---|---|---|---|---|---|
JanusGraph | Databases & Backend-as-a-Service | Graph Database / Distributed | Neo4j AuraDB | 100% Free - Self-Hosted (Apache 2.0) | Yes - Kubernetes / Docker / Binary | Distributed graph database on the Apache TinkerPop/Gremlin stack, pluggable onto Cassandra, HBase, or BerkeleyDB for storage and Elasticsearch or Solr for indexed search, built for horizontal scale under Linux Foundation governance. | |
Neo4j Community Edition | Database Infrastructure | Graph Database | Neo4j AuraDB | 100% Free - Self-Hosted (GPL-3.0) | Yes - Docker / Binary | The open-source core of Neo4j itself, running the same Cypher engine and Bolt protocol as AuraDB but fully self-hosted; clustering, RBAC, and hot backups require the paid Enterprise edition. | |
NebulaGraph | Databases & Backend-as-a-Service | Graph Database / Distributed | Neo4j AuraDB | 100% Free - Self-Hosted (Apache 2.0) | Yes - Kubernetes / Docker / Binary | Shared-nothing distributed graph database that separates storage, compute, and metadata into independently scalable services, built for billion-edge graphs with millisecond query latency. | |
Apache AGE | Databases & Backend-as-a-Service | Graph Database / PostgreSQL Extension | Neo4j AuraDB | 100% Free - Self-Hosted (Apache 2.0) | Yes - Docker / Binary | Adds openCypher graph queries directly inside PostgreSQL, so relational tables and graph traversals share the same database, indexes, and ACID transactions without a separate service to run. | |
ArcadeDB | Database Infrastructure | Graph Database / Multi-Model | Neo4j AuraDB | 100% Free - Self-Hosted (Apache 2.0, no Enterprise split) | Yes - Docker / Binary | Multi-model engine querying graph, document, vector, and time-series data with Cypher, Gremlin, SQL, or GraphQL in one process; includes a Neo4j-compatible Bolt driver plus leader-follower replication and automatic failover in the free edition. | |
Apache HugeGraph | Databases & Backend-as-a-Service | Graph Database / Distributed | Neo4j AuraDB | 100% Free - Self-Hosted (Apache 2.0) | Yes - Kubernetes / Docker / Binary | OLTP graph engine supporting both Gremlin and Cypher over pluggable RocksDB or HStore/HBase backends, with Flink and Spark integration for batch-loading billion-scale datasets under Apache Software Foundation governance. |
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