Apple debuted Sign In with Apple as a part of iOS 13. It is an SSO (Single Sign-On) with focus on user privacy and data. It would be available on all iPhones, iPads, and Macs running iOS 13, iPadOS 13, and macOS Catalina. While unveiling the feature, Apple hyped up its security and privacy features. However, the OpenID Foundation has questioned the implementation of Sign In with Apple.