Apple: over 100,000 iPhone Duo apps, but Instagram still has issues

Two weeks after launch, Apple says the App Store has over 100,000 iPhone Duo apps. But the Instagram app was called messy, so creators should test before posting.

What happened

Apple’s iPhone Duo has been officially on sale for two weeks, and the company said today that the App Store now has over 100,000 apps built for the foldable. The figure was shared by Susan Prescott, Apple’s VP of Worldwide Developer Relations, in a statement: “Today there are well over 100,000 apps built for iPhone Duo already live on the App Store, and thousands of optimized apps are being added to the store each day.”

Prescott added that “the enthusiasm has been incredible, and we’re excited to see the pace of updates continue to accelerate as more and more apps optimize for iPhone Duo.” The announcement positions the iPhone Duo as having quick developer uptake, but early reports show that an optimized app label does not always mean a polished experience.

When the Duo launched, users noted that the Instagram app was a little messy even though Apple gave it the “Made for iPhone Duo” label. Instagram chief Adam Mosseri called the Duo a “bit of a tricky form factor.”

Key facts

• Apple’s iPhone Duo has been officially on sale for two weeks.
• The App Store now has over 100,000 apps built for the foldable, according to Apple.
• Susan Prescott, Apple’s VP of Worldwide Developer Relations, says thousands of optimized apps are being added each day.
• Users noted the Instagram app was a little messy at launch, despite Apple’s “Made for iPhone Duo” label.
• Instagram chief Adam Mosseri called the Duo a “bit of a tricky form factor.”

Our analysis

The speed of developer adoption matters for social media operators because a new device form factor changes how visual content is displayed. Apple’s claim of over 100,000 built-for-Duo apps after two weeks suggests that many platforms are treating the foldable as a real distribution surface rather than a niche experiment. For creators and marketers, that raises the likelihood that at least part of the audience will see content on a different screen layout.

However, the Instagram example is a cautionary signal. Apple’s “Made for iPhone Duo” label did not prevent users from finding the app messy, and Instagram’s chief described the form factor as tricky. This suggests that even major social platforms are still working through layout, cropping and navigation issues on foldable screens. An “optimized” badge should not be taken as proof that Stories, Reels or profile grids will render the way they do on standard iPhones.

With thousands of optimized apps arriving each day, the environment is likely to keep shifting. A feed post or ad creative that looks correct one week may be affected by an app update the next. Operators who treat this as a stable target may miss display problems, while those who monitor it can catch issues before they reach a large audience.

What it means for operators

• Test your brand’s Instagram presence on an iPhone Duo or in a foldable-sized preview; do not rely only on Apple’s “Made for iPhone Duo” label, since even Instagram launched with layout issues.
• Add foldable screen checks to visual QA for Stories, Reels, profile grids and ads, especially if your audience includes early adopters or mobile-heavy viewers.
• Re-test key content after app updates, because Apple says thousands of optimized apps are being added each day and fixes or regressions may appear quickly.
• If you run a social tool or creator app, treating iPhone Duo optimization as a visible product feature could help retention while the platform is still actively courting developers.