HydraDB

HydraDB is presented as a graph database built on object storage, designed to give AI agents accurate retrieval of connected context. The page says it stores decisions, facts, documents, relationships, and knowledge, including how they change over time. It claims 10-100x lower costs than conventional approaches, assisted graph creation, and real-time recall under 200ms. It supports Cypher reads and writes, openCypher and Neo4j drivers, and is available as open source for self-hosting as well as a managed cloud offering. The page also describes native vector search support and positions HydraDB as complementary to vector databases, useful when applications need to follow relationships across sources. Benchmark results (e.g., 90.79% overall accuracy on LongMemEval-S) are cited on the page. Pricing tiers are listed as Open Source, Ship ($25/mo), Scale ($300/mo), and Enterprise (custom).

Key features

• Graph database built on object storage with separate compute for writes, indexing, and reads
• Assisted graph creation and ontology engine for building graphs
• Native vector search support alongside graph search
• Multi-tenant namespace isolation with auto-scaling
• Tiered storage across in-memory, NVMe SSD, and object storage
• Compatibility with existing Neo4j drivers and openCypher queries
• Ability to import graphs from other databases
• Self-hosting on your own infrastructure with S3-compatible storage
• 100+ app connectors for workplace apps, email, and CRM sources
• Advanced logs and monitoring on the Ship tier
• Uptime SLA, SOC 2 and GDPR compliance on the Scale tier
• HIPAA BAA and 99% uptime SLA on the Enterprise tier

Best suited for

• Engineers building agent memory systems
• Teams building company knowledge graphs or company brains
• Developers building GraphRAG applications
• Teams needing ontologies connecting customers, people, and projects across tools
• Organizations that want to self-host an open source graph database

Pricing

Open Source (free, self-hosted); Ship at $25/mo in usage plus storage at $0.50/GB-month and $5 per 1M tokens ingested; Scale at $300/mo in usage plus storage at $0.25/GB-month and $5 per 1M tokens ingested; Enterprise with custom pricing