SquareDev is an open-source platform committed to assisting developers in building applications using large language model technology. It integrates well-known open-source projects such as LangChain, Hugging Face, and Supabase, providing developers with a user-friendly interface and API to lower the threshold for using LLMs. The platform is equipped with strong features for enhanced retrieval and generation of content, semantic search, knowledge extraction, and more, which can help users analyze structured data, generate personalized text, and build chatbots. SquareDev is dedicated to becoming the preferred platform for LLM application development.