Two weeks after the iPhone Duo went on sale, Apple says the App Store already holds "well over 100,000" apps built for it, with thousands more arriving every day. Susan Prescott, Apple's vice president of Worldwide Developer Relations, shared the figure in a statement to 9to5Mac on Friday, November 6.
For scale, the entire App Store needed about 16 months after its July 2008 opening to reach 100,000 apps, a milestone Apple announced in November 2009. The Duo got there in 14 days. That comparison flatters the Duo more than it should, because the two numbers measure different things, and the difference matters to anyone holding one.
What "built for iPhone Duo" counts
According to MacRumors, the 100,000 figure covers apps built with the iOS 27.1 SDK or later. Rebuilding against that SDK is what lets an app fill the full width of both displays, with its controls placed in the status bar. Apps made from Apple's standard SwiftUI and UIKit components get much of that layout work for free once they're rebuilt, including multiple columns on the 7.6-inch inner screen. Older builds still run, but they sit centered on the inner display or stop short of its right edge.
So the count mostly tells you how many developers have shipped an update with Xcode 27.1 since it arrived, which plenty of actively maintained apps would have done in this window anyway. That makes it a real milestone for recompiling, and a weaker one for design. The apps that change how the Duo feels in the hand are the ones using Apple's new APIs for the phone's different layouts and poses, and Apple didn't break that number out.
Apple does give buyers a way to tell the difference. Optimized apps carry a Made for iPhone Duo badge on their App Store product pages, and Apple's editors run collections like "Popular Apps on iPhone Duo" and "Great Games on iPhone Duo." Before you decide an app is worth opening on the big screen, check its product page for that badge.
The everyday gap
MacRumors also went through the apps people open most and listed the ones that still aren't optimized. Delta, Southwest and JetBlue are on it, even though American Airlines and United were on Apple's launch list in October. So are Wells Fargo, PayPal and Venmo, Uber Eats and GrubHub, UPS, USPS and FedEx, Starbucks, Duolingo and Bluesky. Google's Docs, Sheets and Slides haven't caught up, Google Home hasn't either, and neither has Apple's own Apple Store app.
Microsoft is the odd case. Word, Excel, PowerPoint and OneNote are optimized, while Microsoft Teams and Microsoft Authenticator are not. Anyone who has managed company phones knows those last two are the apps a work device can't do without, the ones that get pushed to every enrolled phone on day one. For a phone that starts at $1,999 and that Apple sells partly on getting work done, that's an awkward pair to be missing.
The split between ready and not ready follows a fairly clear line. The early arrivals are big name streaming, social and productivity apps with large iOS teams and every reason to be there at launch: Netflix, YouTube, Instagram, WhatsApp, Zoom, Halide Mark III, Fantastical and Flighty. Utility apps tend to run on their own release calendars, and a bank or airline app that works acceptably in the centered, letterboxed mode has little pressure to jump the queue for a phone that has been on sale for two weeks.
Apple is trying to speed that up. It says more than 2,000 developers have attended over 50 in-person iPhone Duo workshops, with sessions in 19 cities over the past month.
What changes in April
Apple also has a deadline on the calendar. On its developer site, Apple says that starting in April 2027, any apps or games submitted to the App Store will need to include screenshots for iPhone Duo. That doesn't force anyone to redesign for the fold, but it does mean every developer who ships an update after that point has to put their app on a Duo, or the Duo simulator in Xcode, and look at what it does with the inner screen. An app that still sits in a narrow column with black space on both sides is hard to miss in its own product page screenshots.
For anyone whose Duo is still on order, the calendar works in their favor too. On launch day, Apple was quoting January delivery for new U.S. orders of the 256GB model, which gives the slower developers roughly two more months before a lot of these phones reach their owners. The list worth watching until then is the short one: the airline, bank and work apps people open every day, and whether they show up with that badge before the boxes arrive.
If you're still deciding whether the Duo is worth it over the Pro Max, our iPhone Duo vs iPhone 18 Pro Max comparison covers the hardware side.
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