HelixDB
A graph-vector database, written in Rust, that combines graph, vector, key-value, and document storage in one system for knowledge graphs and AI agent memory.
HelixDB is a database built primarily around a graph and vector data model, while also supporting key-value, document, and relational data, aimed at applications that would otherwise need separate application, relational, and vector databases. It gives agents federated access to an organization's data for memory and other applications.
A CLI installs and manages local instances and connects to a hosted Helix Cloud; an interactive bootstrapper can install query skills and a docs MCP server, scaffold a project, start a local instance, seed example data, and hand off to a coding agent to build a working application. Queries are authored with Rust, TypeScript, Go, or Python DSLs that compile to the same JSON query format and are sent to a running instance over HTTP.
It is written in Rust and released under the Apache-2.0 license.