LobeChat is an open source, extensible, high-performance chatbot framework. It can be used as a private ChatGPT/LLM web application with a sophisticated UI design and feature-rich conversation functions. It has been optimized for mobile terminals. It supports full Markdown rendering, including code highlighting, LaTex formulas, Mermaid flowcharts, etc., and can customize AI assistant roles and server domain names. It supports TTS speech synthesis, GPT 4V multimodal interaction, and an extensible function call plug-in system, which can connect to the Internet, draw pictures, crawl, etc.