--- title: "Langflow vs Letta: Which is Better in 2026? | App Stack Builder" description: "Langflow vs Letta compared for 2026 — pricing, free tiers, features, pros & cons. See which agent framework tool is the better fit for your startup." source: https://appstackbuilder.com/compare/langflow-vs-letta retrieved: 2026-10-29 --- ![](https://appstackbuilder.com/logos/langflow.ico) vs ![](https://appstackbuilder.com/logos/letta.png) # Langflow vs Letta: Which is Better in 2026? Agent Framework Choosing between [Langflow](https://appstackbuilder.com/tools/langflow) and [Letta](https://appstackbuilder.com/tools/letta)? Both are popular agent framework tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack. Langflow is for: Teams who want to build and test agent and RAG flows visually, then serve them as APIs or MCP servers. Letta is for: Teams building agents that must remember users and context across sessions and restarts, with memory as the core design. Quick verdict There’s no single winner; pick on your constraint. Choose Langflow if you want to prototype agent or RAG flows visually before writing code. Choose Letta if your agent must remember users and past sessions over weeks or months. ## Langflow vs Letta — Side by Side | | Langflow | Letta | | --------------------- | -------------------------------------------------------------- | ------------------------------------------------------------------------ | | Category | Agent Framework | Agent Framework | | What it is | Visual builder for agent and RAG flows | Agent server and SDKs: agents with persistent memory | | Languages | Visual editor; Python components | Python and TypeScript SDKs | | Licence | MIT | Apache 2.0 | | Managed / paid option | Self-host or Langflow Desktop | Letta API: free tier, Pro $20/month plus usage | | Project status | Active; 1.x | Active | | Pricing | Free | Free · paid from $20/mo | | Starting price | Free tier available | Free tier available | | Free tier | ✓ | ✓ | | Rating | 3.9 | 4.0 | | Best for | Agent Framework — visual builder, RAG prototyping, MCP servers | Agent Framework — long-term memory, stateful agents, self-host or hosted | ## Pros & Cons ![](https://appstackbuilder.com/logos/langflow.ico) [Langflow](https://appstackbuilder.com/tools/langflow) * ✓Fastest way to prototype a chain visually * ✓Exports to code rather than trapping you * ✓Free and self-hostable * ✗Visual editing gets unwieldy past a certain size * ✗Versioning a flow is harder than versioning code ![](https://appstackbuilder.com/logos/letta.png) [Letta](https://appstackbuilder.com/tools/letta) * ✓Memory is the design centre, not an add-on * ✓Agents survive restarts with state intact * ✓Comes from the MemGPT paper * ✗Younger project with a moving API * ✗Memory model is opinionated ## Key Features Compared ### Langflow * ✓Drag-and-drop builder for agents and RAG flows * ✓Flows served as APIs, and exposable as MCP servers * ✓Works as an MCP client as well * ✓Self-host it, or run Langflow Desktop locally * ✓Owned by IBM through its DataStax acquisition * ✓MIT licence ### Letta * ✓Persistent, self-editing agent memory (from the MemGPT research) * ✓Agents keep their state across restarts * ✓Self-hosted server, or the hosted Letta API * ✓Hosted plans: free tier and Pro at $20 a month with pay-as-you-go usage * ✓Letta Code, an open-source coding agent with memory across sessions * ✓Apache 2.0 licence ### Choose Langflow if… * ✓You want to prototype agent or RAG flows visually before writing code. * ✓Non-developers on your team need to edit flows. * ✓You want flows exposed as APIs or MCP servers without extra code. [Langflow review & pricing ](https://appstackbuilder.com/tools/langflow) ### Choose Letta if… * ✓Your agent must remember users and past sessions over weeks or months. * ✓You want agents that keep state when the process restarts. * ✓You want the choice of self-hosting or a hosted API. [Letta review & pricing ](https://appstackbuilder.com/tools/letta) ## Frequently Asked Questions Is Langflow better than Letta?⌄ There’s no single winner; pick on your constraint. Choose Langflow if you want to prototype agent or RAG flows visually before writing code. Choose Letta if your agent must remember users and past sessions over weeks or months. What is the difference between Langflow and Letta?⌄ What it is — Langflow: Visual builder for agent and RAG flows. Letta: Agent server and SDKs: agents with persistent memory. Languages — Langflow: Visual editor; Python components. Letta: Python and TypeScript SDKs. Licence — Langflow: MIT. Letta: Apache 2.0\. Managed / paid option — Langflow: Self-host or Langflow Desktop. Letta: Letta API: free tier, Pro $20/month plus usage. Project status — Langflow: Active; 1.x. Letta: Active. Langflow vs Letta: which is cheaper?⌄ Langflow pricing: Free. Letta pricing: Free · paid from $20/mo. Confirm current pricing on each tool's official site, as plans change. Which is rated higher, Langflow or Letta?⌄ In our catalog, Langflow rates 3.9 out of 5 and Letta rates 4.0 out of 5, so Letta has a slight edge on reviews. When should I skip both Langflow and Letta?⌄ Skip Langflow if your flows will grow large and need code review and versioning. A code library such as LangGraph is easier to manage. Skip Letta if you only need short-lived task agents. A lighter SDK is simpler. Sources · tool facts checked October 2026 1. 1.[Langflowlangflow.org ](https://www.langflow.org/) 2. 2.[Letta Code (Letta docs)docs.letta.com ](https://docs.letta.com/letta-code) See more options in our guide to the [best agent framework tools for startups](https://appstackbuilder.com/categories/agent-framework). ## Still not sure which to pick? Get a free, AI-powered tech stack — including the best agent framework pick for your budget and team — in 60 seconds. [Build my stack free ](https://appstackbuilder.com/build-stack)