# 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. Browse on the web: https://agentsearchengine.app/alternatives/letta ## Commercial alternatives (alphabetical — stars don't measure commercial adoption) - [CrewAI Platform](https://agentsearchengine.app/agents/crewai-platform) — Framework and platform for orchestrating role-playing multi-agent crews. · Freemium · Platform - **vs Letta (formerly MemGPT):** CrewAI Platform is a commercial product; Letta (formerly MemGPT) is open-source and self-hostable. ## Open-source alternatives (ranked by adoption) 1. [langchain](https://agentsearchengine.app/agents/langchain) — The agent engineering platform. · Open source · Framework · 147k★ · Python · MIT · active today · best for builders who want composable primitives and the broadest ecosystem of integrations for llm applications - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, langchain is MIT. 2. [ruflo](https://agentsearchengine.app/agents/ruflo) — The leading agent meta-harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems. · Open source · Framework · 73k★ · TypeScript · MIT · active 1 day ago · best for adding tools, memory, loops, and sandboxes on top of claude code or codex - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, ruflo is MIT. 3. [MetaGPT](https://agentsearchengine.app/agents/metagpt) — A multi-agent framework that assigns software-company roles to LLM agents to turn a requirement into a project. · Open source · Framework · 71k★ · Python · MIT · active 8 months ago · best for experimenting with role-based multi-agent collaboration for software and document generation - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, MetaGPT is MIT. 4. [autogen](https://agentsearchengine.app/agents/autogen) — A programming framework for agentic AI; upstream is in maintenance mode. · Open source · Framework · 61k★ · Python · CC-BY-4.0 · active 5 months ago · best for research-grade multi-agent conversation patterns backed by microsoft - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, autogen is CC-BY-4.0. 5. [crewAI](https://agentsearchengine.app/agents/crewai) — Framework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks. · Open source · Framework · 59k★ · Python · MIT · active today · best for orchestrating role-based multi-agent crews in python with an approachable api - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, crewAI is MIT. 6. [LlamaIndex](https://agentsearchengine.app/agents/llamaindex) — Framework for connecting LLMs and agents to your own documents and data. · Open source · Framework · 52k★ · MIT · active today · best for retrieval-heavy applications where the hard part is getting your own documents and data into an agent reliably - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, LlamaIndex is MIT. 7. [LangGraph](https://agentsearchengine.app/agents/langgraph-platform) — LangChain's low-level orchestration framework for stateful, controllable agents. · Open source · Framework · 42k★ · Python · MIT · active today · best for production agents that need controllable, stateful, graph-based orchestration - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, LangGraph is MIT. 8. [DSPy](https://agentsearchengine.app/agents/dspy) — Stanford's framework for programming, not prompting, language models, with optimisers for prompts and weights. · Open source · Framework · 38k★ · Python · MIT · active today · best for systems where you can define a metric and want prompts tuned automatically instead of by hand - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, DSPy is MIT. 9. [CopilotKit](https://agentsearchengine.app/agents/copilotkit) — The frontend stack for agents: generative UI, shared state and human-in-the-loop for web, mobile, Slack and Teams. · Open source · Framework · 37k★ · TypeScript · MIT · active today · best for putting an existing agent in front of users with rich, interactive ui rather than a plain chat box - **vs Letta (formerly MemGPT):** Licensing differs: Letta (formerly MemGPT) is Apache-2.0, CopilotKit is MIT. Showing the 10 closest of 54 agent frameworks indexed here. Complete list: https://agentsearchengine.app/category/agent-frameworks ## FAQ **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. --- Source: [Agent Search Engine](https://agentsearchengine.app) — https://agentsearchengine.app/alternatives/letta