Chroma

Managed memory layer that extracts, dedupes, and retrieves long-term memories per user, agent, or session

Open-source memory engine that builds a queryable knowledge graph from documents, code, and conversations

Serverless Postgres with instant branching, autoscaling, and a remote MCP server

Open-source vector search engine with managed cloud and an official MCP server

Temporal knowledge-graph memory (Graphiti) with bi-temporal validity, so agents can query what was true when

Stateful agent runtime where memory is the agent — self-editing core memory, archival recall, and a REST API