The iPhone Duo goes on sale tomorrow, Friday, October 23, in the US, the UK, Canada, Japan, China, India and the rest of Apple's first wave, with 28 more countries following on October 30. It starts at $1,999. Today Apple published a long Newsroom post about the apps rebuilt for it. (Source)
A launch-eve app roundup is part marketing and part signal. The marketing is obvious. The signal is in which companies showed up, and what they decided to do with a second half of a screen.
What the big apps are doing
- Netflix: scroll Clips on the outer screen, then open the phone and keep watching on the big inner one.
- Prime Video: half folded, the show plays on the top half and X-Ray, the cast and trivia panel, fills the bottom.
- MLB: propped on a table, the game plays on the upright half and live stats sit on the flat half.
- Zoom: the inner display becomes the meeting room, with shared slides and faces on screen at the same time.
- Microsoft Word and Outlook: a "desktop-class" layout, formatting tools beside the document and the inbox beside the open message. That one rolls out "in the coming weeks," not tomorrow.
- Slack, Salesforce, Fantastical, Things and Bear: more of your workspace on one screen.
- Detail: the video app runs its AI models on the phone itself, using Apple's new Core AI framework.
The quiet headline is Split View. For the first time, you can run two apps side by side on an iPhone. iPad owners have had that for over a decade. On a phone it changes the question I ask about every screen I design, from "how does this fit" to "what if it's only getting half."
What it means if you build apps
Apps that are optimized get a "Made for iPhone Duo" badge, and Apple starts running Duo collections on the App Store on Friday. For a small developer, that badge is the real news. Being featured is the closest thing an indie app gets to free advertising, and Apple just said out loud what it wants to feature this holiday. Apple says more than 2,000 developers went to over 50 in-person workshops in 19 cities to get ready.
The tools are better than I expected. Xcode 27.1 adds Device Hub, which lets you open, close, fold and rotate a simulated Duo to test every position. The iOS 27.1 SDK adds a hinge API and APIs for keeping content out of the fold. And standard SwiftUI and UIKit layouts adapt on their own. That last part matters most for a one-person studio like mine. If you built your screens the way Apple has been asking for years, with flexible layouts instead of fixed sizes, most of the work is already done. If you didn't, tomorrow is when your users find out.
My own Duo isn't due until early November, so the simulator is what I have. A simulator tells you whether a layout breaks. It doesn't tell you whether an app feels right in your hand at 11 p.m. I'll write about my own apps once I've held one.
Three things Apple didn't say
The summary I was handed for this post had three details I couldn't find in Apple's announcement.
- StandBy in tent mode. Apple's post talks about the phone "propped up" and "partially folded," with video on one half and controls or stats on the other. StandBy isn't mentioned once.
- Dragging media between the two halves. Split View is real. Drag and drop between the panels isn't in the post.
- No walk-ins in every major market. Apple's post doesn't mention stores at all. What's actually been reported is narrower. Apple's Japan store says the Duo is reservation only at launch, and Bloomberg's Mark Gurman says Korea's restriction covers only the iPhone 18 Pro Max. In the US there's no official policy, only reports that some store managers are warning people not to expect stock. (Source)
The practical advice is the same either way: don't line up without a reservation. But "Apple said so" and "a store manager said so" are different sentences, and I'd rather you know which one you're reading. I'd also soften one more claim going around, that adaptive multi-window layouts are now a requirement for premium iOS apps. Apple didn't make that a rule. It made it a badge. For an app that wants to be featured this holiday, the difference is small.
If you're picking one up tomorrow
Update your apps right after setup, because several of these updates land Friday, and check again in a couple of weeks for Word and Outlook. And if an app looks stretched or boxed in on the inner screen, that's the developer, not your phone. Give us a few weeks. Some of us are still waiting on our own Duo.
Verified October 22, 2026. Apps, launch dates, price, badge, Device Hub, the hinge API and the workshop numbers from Apple Newsroom. Japan and Korea reservation rules and the US store reports from MacRumors. Apple's post does not mention StandBy, drag and drop between halves, or walk-in availability.
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