X has completed a year-long rebuild of its Android app, described by head of product Nikita Bier as one of the largest engineering projects since Elon Musk's acquisition of Twitter in 2022. The app was developed from scratch to improve the user experience for Android mobile users, with plans to roll out new features more quickly. The engineering team is still working on features like hosting Spaces and optimizing performance for older devices. The rebuild was prompted by a surge in Android app downloads last year and aligns with Musk's vision of transforming X into an "everything app." The launch comes amid challenges such as reduced content moderation, an advertiser boycott, and user attrition. X has also introduced X Chat, a private messaging service, and X Money, a digital payments platform, while implementing measures to promote original content. The rebuilt Android app is now available for download on the Google Play Store.