Open WebUI is a user-friendly web user interface designed for LLMs (Large Language Models), supporting API compatibility with Ollama and OpenAI. It offers an intuitive chat interface, responsive design, rapid response performance, easy installation, syntax highlighting for code, support for Markdown and LaTeX, local RAG integration, web browsing capabilities, support for prompt presets, RLHF comments, session marking, model download/remove, GGUF file model creation, multi-model support, multi-modal support, model file builder, collaborative chat, and integration with the OpenAI API.