The X app on iPhone is a social media app that was formerly known as Twitter. The app was rebranded as X by its owner, Elon Musk, and is now listed as X in the iOS App Store. The app allows users to post content for the world to see and join public conversations, stay up to date on news, and more. The X app is available for download on the App Store and can be used on an iPhone, iPad, or iPod Touch device. The apps privacy practices may include handling of data such as purchases, location, contact info, user content, browsing history, identifiers, and usage data.