Instagres is a tool that allows users to spin up a fully functional Postgres database in their browser in under a second, providing instant access and flexibility to transfer the database to a free Neon account when needed. It offers two ways to launch Postgres databases: through the browser or using the CLI with NodeJS. Instagres works by interacting with Neon's API to create a new Postgres database, which can be claimed for long-term use with one click. The tool is built as a Cloudflare Workers app and uses React Router v7 and Drizzle ORM to manage queries. It also includes bot protection measures such as Turnstile CAPTCHA and rate limiting APIs to prevent abuse.