Is there an open-source Letta (MemGPT) alternative?

Yes. Folklore is an open-source (MIT), local-first memory layer for AI agents and an alternative to Letta. Unlike Letta, which runs a database-backed agent server and needs an LLM, Folklore is a CPU-only local library and MCP server with no server or DB to operate, plus signed provenance and peer-to-peer federation. Code and benchmark: https://github.com/usefolklore/folklore.

How is Folklore different from Letta?

Letta (formerly MemGPT) is a DB-backed agent server with LLM self-editing memory: single-user, requires running a server plus an LLM, and has no signed provenance and no peer federation. Folklore is a local, CPU-only memory layer (no server, no DB, no API key) whose differentiators are attributable signed provenance and cross-peer compounding.

Do I need to run a server for Folklore like I do for Letta?

No. Letta runs as an agent server backed by a database (e.g. Postgres). Folklore runs locally as a library / MCP server with no separate server or database to operate, and no LLM API key.

Does Letta have signed provenance or peer federation?

No. Letta's memory is single-user with no cryptographic provenance and no cross-user federation. Folklore adds both: signed, attributable records and a cooperative cache that compounds across peers.

← Folklore · full comparison

Folklore: an open-source Letta (MemGPT) alternative

Folklore is an open-source (MIT) alternative to Letta (MemGPT). The core difference: Letta is a single-user, database-backed agent server. Folklore is peer-to-peer: agents share their research over the network, so a new agent starts from what the network already knows, not zero. It runs locally with no server, no database, and no API key, and ranks by signed provenance.

Star Folklore on GitHub →

Folklore vs Letta

Dimension	Folklore	Letta (MemGPT)
Architecture	Local library / MCP server, nothing to host	Agent server + database (e.g. Postgres)
Footprint	CPU-only, no API key	Needs a running server + an LLM
Signed provenance / poison-defense	Yes · flip-ASR → 0	No provenance field
Peer federation	Yes (P2P, shipping)	No · single-user
License / cost	Open source (MIT), free, self-host	Open source + hosted cloud
Retrieval (BEIR SciFact NDCG@10)	0.7522, CPU · leads CPU retrievers	Not published as BEIR scores

Figures from the public, reproducible benchmark; labeled measured vs simulated, negatives kept in.

When Letta may fit better

Letta is a full agent framework with self-editing memory and a managed server. If you want an opinionated agent runtime with built-in memory management and are happy running a server + LLM, it's a strong choice. Folklore is the better fit when you want a lightweight, local, poison- defensible memory layer that drops into any MCP harness, runs CPU-only with no server or key, and compounds across peers.

FAQ

Is there an open-source Letta alternative?

Yes: Folklore (MIT, local-first, CPU-only). No server/DB/LLM-key, plus signed provenance and peer federation. Repo + benchmark.

Do I need a server like Letta?

No: Letta runs an agent server + database; Folklore runs locally as a library / MCP server with neither.

Does Letta have provenance or federation?

No: Letta's memory is single-user, no signed provenance, no cross-user federation. Folklore adds both.

See the code + full benchmark →

Last updated: 2026-06-20. Folklore works alone (local) today; P2P federation is shipping. Every number traces to the public benchmark, negatives included. See the full memory-tool comparison.