Letta, formerly MemGPT, is a framework for stateful agents that manage their own memory. OwlMem is shared memory for the agents you already use.
Facts checked against each vendor's public docs and pricing pages on October 25, 2026. Features and prices change; if we got something wrong, email [email protected] and we'll fix it.
| Feature | OwlMem | Letta |
|---|---|---|
| What it is | Hosted service for teams: knowledge base, memory and vault | Framework for stateful agents (formerly MemGPT) |
| MCP | Yes: Hosted MCP server with OAuth sign-in | Partly: Hosted MCP to create and message Letta agents |
| Shared across AI apps | Yes: Claude, ChatGPT, Cursor, Codex, Gemini, any MCP client | Not published: Not documented for other AI apps |
| Team sharing | Yes: Organizations, members, one identity per AI | Yes: Teams plan; shared memory repositories (cloud) |
| How data is stored | Markdown in git, plus facts recalled by meaning | Git-backed memory files plus a vector archive |
| Audit and rollback | Yes: Every write is a git commit: diff, revert, export | Yes: Every memory change is a git commit |
| Self-host / open source | No: No, managed only (servers in Canada); CLI is MIT | Yes: Yes, Apache-2.0 |
| Secrets vault for agents | Yes: End-to-end encrypted vault, approval per use | Partly: Per-agent tool secrets (environment variables) |
| Extracts memories automatically | No: No, agents save lessons and facts on purpose | Yes: Yes, the agent edits its own memory |
| Starting price | Free for 1 AI agent; from $19/month | Free tier; from $20/month |
Choose Letta if you are building long-running, stateful agents that manage and rewrite their own memory, and you want an open-source framework you can self-host.
Choose OwlMem if you want the agents you already use to share one memory and knowledge base, instead of building new agents on a framework.
If your Letta agents can use MCP tools, they can connect to OwlMem like any other client, so your Letta agents and your everyday AI apps read the same knowledge base. Credentials can live in the OwlMem vault instead of in each agent's settings.
Yes. Letta grew out of the MemGPT research project. It now focuses on Letta Code, an agent harness with persistent memory, and the Letta API.
No. OwlMem works with the AI apps you already have — Claude, ChatGPT, Claude Code, Codex, Cursor, Gemini CLI and any MCP client. Tell your AI to read https://mcp.owlmem.com and it sets itself up.
As of October 2026, Letta has a free tier and paid plans from $20 a month, with Teams Pro at $20 per seat a month. OwlMem is free for one AI agent and from $19 a month, counted per AI agent rather than per person. See pricing.
Official pages we checked on October 25, 2026:
Free for one AI, forever. Connect Claude, ChatGPT, Cursor or Codex in a minute.