MemOS

Memory operating system that gives LLM agents long-term, structured recall across sessions and models.

Freemium· Free tier; Starter $19/mo, Pro $286/mo (promo $0 at launch); Enterprise customAgentsMulti-model

Best for

Pick MemOS if you are building stateful agents or RAG systems that need durable, structured memory beyond a single vector store.

Skip if

Skip it if you just want a chatbot UI or a managed assistant; this is plumbing, not a product end users touch.

MemOS is a memory management layer for AI applications, positioning itself as an operating system for agent and RAG memory rather than a model or chat product. It provides millisecond-latency read/write APIs, structured memory with dynamic knowledge graphs, and cross-model memory sharing so an assistant can carry context between sessions, tools, and even different underlying LLMs.

The project ships as an open-source core on GitHub plus a hosted service at memos.openmem.net with free, Starter, Pro, and Enterprise tiers gated by API calls and knowledge-base capacity. It targets developers building stateful agents, customer-facing assistants, or long-running RAG pipelines who have outgrown ad-hoc vector-store-plus-summary patterns and want a dedicated substrate for episodic, semantic, and procedural memory.

Integrations cover MCP (Model Context Protocol), common agent frameworks, and enterprise deployments at firms like Alibaba, Anker, and Haier. Deployment is flexible across cloud, private, on-prem, and hybrid setups, which matters for teams that can't ship user transcripts to a third-party SaaS.

Editor's take

MemOS is a credible attempt to standardize agent memory as a first-class layer rather than something every team reinvents on top of Pinecone. The open-source-plus-hosted split is the right shape, and MCP support is forward-looking. Worth a real prototype if you are past toy-agent stage.

— The AI Tool Bible editorial team