Langflow

Free tier

Low-code AI builder for agentic and RAG applications

Free tier available·All audiences·Powered by Multi-provider (supports all major LLMs including Anthropic, OpenAI, Meta, Mistral, NVIDIA, Ollama, Groq, HuggingFace, Amazon Bedrock, Perplexity, and more)·API available·Open source

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Key strengths

Visual low-code flow builder with drag-and-drop interfaceSupports all major LLMs and vector databasesPython customization under the hoodAgentic and RAG application supportFree cloud deployment and self-hosting optionsLarge library of pre-built flows and componentsMCP server supportOpen source (MIT License)

Free tier + paid plans

Founded 2023

Self-hostable

Facts verified against langflow.org on Oct 5, 2026

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Langflow's architecture centers on a visual flow builder where each node represents a component (LLM, vector store, retriever, agent, tool, etc.) that can be wired together via a drag-and-drop interface. Under the hood, flows are executed as Python, and developers can inject custom Python code into any component for full extensibility. Key technical capabilities include:

Multi-LLM support: Connect to OpenAI, Anthropic, Meta, Mistral, NVIDIA, Ollama, Groq, HuggingFace, Amazon Bedrock, Perplexity, and more within the same flow.
Vector database integrations: Pinecone, Weaviate, Milvus, Qdrant, Couchbase, Redis, Upstash, Vectara, Cassandra, and others for RAG pipelines.
Agentic patterns: Native support for agentic workflows and multi-agent orchestration (including CrewAI).
API access: Flows can be exposed and consumed via API, enabling integration into existing applications and services.
MCP server support: Compatible with the Model Context Protocol for standardized model-tool communication.
Pre-built components & flows: A large library of ready-to-use components and flow templates accelerates development.
Deployment options: Free managed cloud tier, enterprise cloud platform, or self-hosted OSS deployment.
Integrations: 44+ integrations including Airbyte, Composio, LangChain, Zapier, Slack, GitHub, Google Drive, Notion, Confluence, and more.