Postgres.new` is an in-browser Postgres sandbox with AI assistance that allows users to spin up unlimited number of databases and run them locally without the need for remote containers or WebSocket proxies. The application uses a WASM version of Postgres called PGlite, which can run directly in the browser, and pairs it with a large language model (LLM) to provide features such as drag-and-drop CSV imports, generate charts, build database diagrams, and more. The AI assistant is fully autonomous over the database, allowing for faster execution of queries without delay. The application also supports semantic search and RAG using Postgres extensions like pgvector and live. With `postgres.new`, users can deploy their databases to S3, share them with others, and access them from anywhere on the internet, making it an ideal solution for developers who want to test and experiment with different database configurations without incurring high costs.