Apple is launching new editorial collections of apps and games optimized for iPhone Duo on the App Store this Friday. An easy-to-spot "Made for iPhone Duo" badge will denote these updated applications. This optimization process is standard for Apple with each significant screen size change. Previous transitions, like the iPhone X or iPhone 6 Plus introduction, also saw apps requiring updates. Unoptimized apps can lead to a frustrating user experience, prompting users to seek alternatives. Developers understand the importance of optimized app appearance and functionality to iPhone users. Some users may even cease using unoptimized apps until updates are released. The author believes more third-party apps are ready for the Duo launch than for previous transitions. While not all apps are updated, developer support for the Duo appears strong. This developer engagement contrasts significantly with the Android foldable market, which has had years of support with less robust developer adoption.