Langflow is an open-source, low-code platform for building AI agents, retrieval-augmented generation pipelines, and multi-step AI workflows using a drag-and-drop visual editor. Originally acquired by DataStax in 2024, it is now being acquired by IBM. The software itself is free and MIT-licensed on GitHub (40,000+ stars); production deployment costs come from cloud hosting and LLM API usage. It supports connections to OpenAI, Anthropic, Google Gemini, Cohere, HuggingFace, and local models via Ollama, and can export flows as REST APIs or MCP servers. Key features: - Drag-and-drop visual flow builder for agents and RAG pipelines - Connects to 20+ LLM providers including OpenAI, Claude, Gemini, Ollama - Interactive playground for step-by-step flow testing and iteration - Export flows as REST APIs or as MCP servers for tool use - Python-customizable components; fully open source on GitHub - DataStax-hosted cloud option with free tier
Open source (free, self-hosted). DataStax cloud hosted version has a free tier; production workloads incur hosting and LLM API costs estimated at $30-$2,000+/month depending on scale.