Auth Connect 4, released by Ionic, is a significant update to their authentication solution for mobile applications, enhancing security across web, Android, and iOS platforms by leveraging the OAuth 2.0 standard. This version introduces substantial improvements, such as compatibility with both Capacitor and Cordova projects through a new Compatibility Plugin, a reworked developer experience that supports various JavaScript frameworks beyond Angular, and a shift to stateless authentication sessions that offer transparent storage options. Auth Connect 4 also adopts a more flexible approach to supporting authentication providers, allowing developers to customize interactions with their providers or create custom providers if needed. With these advancements, Ionic aims to simplify the authentication process for enterprises and improve ease of implementation and management of secure authentication flows.