Apple says more than 100,000 apps are now built for the iPhone Duo, two weeks after it went on sale, and that thousands more are arriving every day. Susan Prescott, Apple's vice president of worldwide developer relations, said "well over 100,000" are live on the App Store. MacRumors confirmed with Apple what the number counts: apps built with the iOS 27.1 developer tools or later, which fill the full width of both screens and put their controls in the status bar.
There are millions of apps in the App Store, and MacRumors found these still missing: Google Docs, Sheets and Slides, Microsoft Teams and Authenticator, PayPal, Venmo, Wells Fargo, Uber Eats, DoorDash, Starbucks, Delta, Southwest, JetBlue, FedEx, UPS, Ring, Nike, Duolingo, Steam and YouTube Music, among others. Apple's own Apple Store app is on that list too.
Those apps still open, and how they look depends on how old they are. An app built with the iOS 27 tools resizes to fill most of the inner screen but stays clear of the status bar on the right edge. An app built with iOS 26 tools or earlier sits in the center of the inner screen, with a lot of empty black space on both sides. Paying for a big folding screen and getting your bank app in the middle of it is a bad look at this price.
Apple Pencil support also arrived with iOS 27.2, so apps like Procreate Pocket, Apple Notes and Preview now take a USB-C Pencil on the Duo.
The apps that have made the jump include Excel, OneNote, PowerPoint and Word, Netflix, Instagram, WhatsApp, YouTube, Prime Video, Zoom, Etsy, Goodnotes, Flighty and Fantastical. Many of the big entertainment and social apps are ready. Work is split, with Microsoft's Office apps done and Google's not, and the banks, payment apps and airlines on that list are still waiting.
Optimized apps carry a "Made for iPhone Duo" badge in their App Store listings when you view them on the device. Apple Pencil support also arrived with iOS 27.2, so apps like Procreate Pocket, Apple Notes and Preview now take a USB-C Pencil on the Duo.
Apple says standard SwiftUI and UIKit apps adapt on their own, which helps explain the speed. It has also run more than 50 in-person workshops in 19 cities. That missing list should keep getting shorter.
If you're waiting on a Duo anyway, this is the good news: orders were taking about three months at last count, so plenty of these gaps may close before yours arrives. Before you buy, go through the five or six apps you open every day. If one of them is a bank or a work app that's still on the missing list, assume it'll look like a phone app on a big screen until its developer says otherwise.