Apple says more than 100,000 App Store apps are already optimized for iPhone Duo. The company reports that thousands of additional optimized apps are being added each day, two weeks after the device went on sale.
Apple defines an optimized app as one built with the iOS 27.1 SDK or later. These versions can use the full width of the inner and outer displays and correctly adapt their controls to the foldable form factor.
During the past month, Apple held more than 50 workshops across 19 cities. According to the company, more than 2,000 developers attended and worked on adapting their apps for the new device.
Microsoft Word, Outlook, Zoom, Etsy, and Halide Mark III are among the notable apps that have added iPhone Duo support. Some widely used apps are still not fully adapted, so the ecosystem continues to evolve.