What is the best alternative to Letta (formerly MemGPT)?

It depends on whether you'd rather self-host or buy a managed product. langchain is the most widely-adopted open-source alternative (147k GitHub stars); CrewAI Platform is one of the commercial options. Compare the full list above on adoption, license, and pricing.

Is there a free or open-source alternative to Letta (formerly MemGPT)?

Yes. langchain, ruflo, and MetaGPT are open-source agent frameworks you can self-host for free — you still pay for the infrastructure you run them on and any model or API usage. See the ranked open-source list above.

How are these Letta (formerly MemGPT) alternatives ranked?

Every product in the agent frameworks category is a candidate. Open-source alternatives are ranked by maintained adoption — GitHub stars plus recent commit activity — so you see what's genuinely used, not abandoned. Commercial products are listed separately and alphabetically, because stars don't measure commercial adoption. Sponsored placement is always labeled and never affects the ranking.

Alternatives · Agent Frameworks

Letta (formerly MemGPT) alternatives

Looking for an alternative to Letta (formerly MemGPT)? Below are the agent frameworks in our index that do a similar job — open-source options are ranked by real maintained adoption (GitHub stars and recent commit activity), never by sponsorship. Letta (formerly MemGPT) is open source, so the list below includes both other self-hostable projects and commercial products.

the 10 closest of 54 · all agent frameworks · how we rank

The product you're replacing

Letta (formerly MemGPT)FrameworkAgent Frameworks

Stateful agents with persistent memory that learn and improve over time, formerly MemGPT.

Open source · 25k stars · Apache-2.0 · updated Sep 2026

Visit Letta (formerly MemGPT) →Full Letta (formerly MemGPT) record

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Commercial alternatives to Letta (formerly MemGPT)

Listed alphabetically — GitHub stars don't measure commercial adoption.

CrewAI PlatformPlatformFramework and platform for orchestrating role-playing multi-agent crews.FreemiumVerified

vs Letta (formerly MemGPT) — CrewAI Platform is a commercial product; Letta (formerly MemGPT) is open-source and self-hostable.

Open-source alternatives to Letta (formerly MemGPT)

Ranked by maintained adoption — self-hostable and free to run.

langchainFrameworkThe agent engineering platform.Open sourcePython · MITVerified · Active 147kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, langchain is MIT.

rufloFrameworkThe leading agent meta-harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems.Open sourceTypeScript · MITVerified · Active 73kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, ruflo is MIT.

MetaGPTFrameworkA multi-agent framework that assigns software-company roles to LLM agents to turn a requirement into a project.Open sourcePython · MITVerified 71kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, MetaGPT is MIT.

autogenFrameworkA programming framework for agentic AI; upstream is in maintenance mode.Open sourcePython · CC-BY-4.0Verified 61kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, autogen is CC-BY-4.0.

crewAIFrameworkFramework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks.Open sourcePython · MITVerified · Active 59kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, crewAI is MIT.

LlamaIndexFrameworkFramework for connecting LLMs and agents to your own documents and data.Open sourceMITVerified · Active 52kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, LlamaIndex is MIT.

LangGraphFrameworkLangChain's low-level orchestration framework for stateful, controllable agents.Open sourcePython · MITVerified · Active 42kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, LangGraph is MIT.

DSPyFrameworkStanford's framework for programming, not prompting, language models, with optimisers for prompts and weights.Open sourcePython · MITVerified · Active 38kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, DSPy is MIT.

CopilotKitFrameworkThe frontend stack for agents: generative UI, shared state and human-in-the-loop for web, mobile, Slack and Teams.Open sourceTypeScript · MITVerified · Active 37kGitHub stars

vs Letta (formerly MemGPT) — Licensing differs: Letta (formerly MemGPT) is Apache-2.0, CopilotKit is MIT.

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Frequently asked

What is the best alternative to Letta (formerly MemGPT)?: It depends on whether you'd rather self-host or buy a managed product. langchain is the most widely-adopted open-source alternative (147k GitHub stars); CrewAI Platform is one of the commercial options. Compare the full list above on adoption, license, and pricing.
Is there a free or open-source alternative to Letta (formerly MemGPT)?: Yes. langchain, ruflo, and MetaGPT are open-source agent frameworks you can self-host for free — you still pay for the infrastructure you run them on and any model or API usage. See the ranked open-source list above.
How are these Letta (formerly MemGPT) alternatives ranked?: Every product in the agent frameworks category is a candidate. Open-source alternatives are ranked by maintained adoption — GitHub stars plus recent commit activity — so you see what's genuinely used, not abandoned. Commercial products are listed separately and alphabetically, because stars don't measure commercial adoption. Sponsored placement is always labeled and never affects the ranking.