A new phone is only as good as the apps you open on it every day.
That sounds obvious, but it’s easy to forget when the hardware is the headline. A bigger, folding screen looks great in a store demo. It looks a lot less exciting when your banking app or music player shows up stretched, squashed or framed in black bars.
Most people open the same handful of apps dozens of times a day, from email and maps to music and video. Those are the apps a new screen has to win over.
That gap matters even more when a phone costs about as much as a good laptop. Paying a premium for a big screen only makes sense if the software actually fills it.
It’s also the exact problem the first wave of reviews flagged. Now the company behind the phone is trying to close it, just as the device reaches stores.
Apple (AAPL) said on Oct. 22 that more than 50 third-party apps are optimized, or soon will be, for the iPhone Duo’s foldable design. The list includes Netflix, Zoom, Slack, Microsoft Word and Instagram.
The announcement landed one day before the Duo’s Oct. 23 launch. Apps built for the phone will carry a new “Made for iPhone Duo” badge on their App Store pages, and Apple is rolling out curated collections of Duo-ready apps and games.
Apple says 50-plus apps, including Netflix, Zoom and Slack, support or are coming soon to iPhone Duo.Benjamin Fanjoy / Getty Images
Netflix, Zoom and Word use the Duo’s bigger screen
The Duo’s inner display is 50% larger than the iPhone 18 Pro Max screen, and it brings Split View to the iPhone for the first time.
Optimized apps change their layout depending on how you hold the phone. Here is what some of the biggest names are doing, according to Apple’s list:
Netflix: Browse short Clips on the outer screen, then open the phone to keep watching on the inner display.
Zoom: Shows shared content and participants on screen together.
Microsoft Word: Puts formatting tools beside your document in a desktop-style layout.
Microsoft Outlook: Shows your inbox next to the full message.
Slack: Shows more of your workspace, with channels and threads easier to follow.
MLB: Plays the live game on the upright half while stats run below when the phone is propped up.
Netflix says the app reacts to the hardware in real time. The experience “adapts as iPhone Duo opens, closes, or turns,” said Tom Richards, Netflix’s senior director of engineering.
Related: T-Mobile adds monthly fee to a new iPhone feature for customers
Apple’s own developer chief sounded upbeat. Developers have been quick to embrace the Duo’s “larger display and new ways to interact,” said Susan Prescott, Apple’s vice president of worldwide developer relations.
Which apps aren’t ready for the iPhone Duo yet
The fine print matters here. Microsoft Word and Outlook won’t have their Duo versions at launch, with updates expected “in the coming weeks,” Gadget Review reported.
More on the iPhone Duo:
AT&T CEO drops 4-word verdict on new Apple iPhone Duo
Apple extends iPhone Duo delivery, disappointing eager customers
Apple’s $1,999 iPhone bet just got its first answer
Some of the most-used apps aren’t on Apple’s list at all. Spotify, Google Maps, Discord, X and Google Calendar weren’t properly optimized during testing, showing black bars or shrunken layouts, Marques Brownlee said in his review, Dexerto reported.
Brownlee, the YouTube reviewer known as MKBHD, called app support the Duo’s biggest weakness at launch. Most current iPhone apps still look squashed on the front screen and sparse on the inner one, AppleInsider’s William Gallagher wrote.
Developers also had little time. Apple opened Duo app submissions on Oct. 8, and developers could only test in a simulator at first, according to AppleInsider.
“Apple may see it as giving developers time, but instead it’s always giving them a dilemma,” Gallagher wrote.
Why app support matters for your wallet
This is the part I’d weigh most if you’re on the fence. The Duo starts at $1,999 for 256GB, $700 more than the iPhone 18 Pro Max.
That $700 premium buys you the bigger folding screen. If the apps you rely on most still run in a phone-sized box, you’re paying for screen space you can’t fully use yet.
In my analysis, that makes the app list a buying checklist, not a press release. A Duo owner who lives in Netflix, Zoom and Slack gets far more value on day one than someone who spends the day in Spotify and Google Maps.
Apple’s own financing shows how fast the premium adds up. The Duo runs $83.29 per month for 24 months, versus about $54 per month for the Pro Max over the same period.
How to check your apps before you buy
You don’t need to guess. A few quick steps can tell you whether the Duo fits the way you actually use your phone.
Look for the badge. Search your five most-used apps in the App Store and check for “Made for iPhone Duo” on the product page.
Browse Apple’s collections. Apple’s curated lists of Duo-ready apps and games went live on launch day.
Try it in a store. Open your own apps on a demo unit, not just the ones Apple preloads.
Wait if you can. New Duo orders already ship in January, Dexerto reported, which gives developers more time to catch up.
Apps built with the newest iOS 27.1 tools can adapt to each folding position, while older apps still run but usually show a standard iPhone layout, Gadget Review reported.
The upside for early iPhone Duo buyers
There’s real promise here. Some smaller developers moved fast, and their apps show what the Duo can do when software meets the hardware.
The Duo “feels like the full Fantastical experience from Mac and iPad, right in your pocket,” said Michael Simmons, CEO of calendar app maker Flexibits, according to iPhone in Canada.
Sports fans may like it most. With MLB’s app, fans “never have to choose between the broadcast and the box score,” said Kenny Gersh, MLB’s executive vice president of media, business development and product.
Apple says more updates will arrive throughout the year. More than 2,000 developers have already attended Apple’s in-person Duo workshops.
The Duo’s hardware is finished. Its app library is still being built, and how fast that happens decides whether $1,999 feels like a bargain or a beta test.
Related: MKBHD drops a blunt verdict on Apple’s $1,999 iPhone Duo