Replit has launched App History, a unified timeline that allows developers to roll back to earlier versions of their app or preview them live in the browser. This feature uses Neon branching under the hood, capturing both code and data at every checkpoint, making it possible to rewind the database to any point within a 7-day window. With App History, users can comfortably test changes, debug incidents from the past, and let users fork and explore. The feature improves security and reliability by reducing the risk of bad migrations or data corruption, and enables new development patterns such as safe experimentation with AI agents. Replit's integration with Neon allows for fast and lightweight branching, making it possible to build features like App History that feel magical to users.