Finance v7.35.0
Does Amex work on iPhone Duo?
Mostly. Amex 7.35.0 is built with the iOS 27.0 SDK, so it fills most of iPhone Duo's inner display but leaves some space unused.
At a glance
- Inner display (7.6″)
- Partly adapted
- Outer display (5.4″)
- Works normally
- Built with
- iOS 27.0 SDK
- Version 7.35.0, read Oct 29, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v7.35.0
- Oct 29, 2026
- Duo in release notes
- Not yet
About Amex
Amex is made by American Express and first came out on the App Store in March 2010. It has 4,451,402 ratings on the US App Store, averaging 4.9 stars. Version 7.35.0 came out on Oct 29, 2026 and needs iOS 18.2 or later. It's free to download. Among the 25 banking & finance apps we track on the US App Store, 8 already fill the inner display, 4 are partly adapted and 12 still show black bars. By number of ratings, Amex is #10 of them.
From its App Store listing:
The official American Express App for iPhone allows you to access your Account from anywhere. Track spending & rewards, find offers, review your balance, pay your bill and enjoy features only available in the Amex App. Touch ID and Face ID login (on supported devices), gives you quick, safe and secure access. Make the most of your Membership with the speed, security and convenience of the mobile A…
On the inner display
Built with the iOS 27 SDK, the app extends across most of the inner display, but some areas stay empty. It's usable, just not polished.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Amex. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 7.35.0 is built with the iOS 27.0 SDK
Apple gives apps built with the iOS 27.0 SDK more of the inner display, with some space left over.
- : Not confirmed yet → Black bars — built with the iOS 26.5 SDK
- : Black bars → Partly adapted — built with the iOS 27.0 SDK
Latest release notes
Version 7.35.0 · Oct 29, 2026
We're constantly making improvements to help ensure you have the best experience. In this release we focused on bug fixes and enhancements to make the app faster and more secure.
Questions
Does Amex work on iPhone Duo?
Mostly. Amex 7.35.0 is built with the iOS 27.0 SDK, so it fills most of iPhone Duo's inner display but leaves some space unused.
Does Amex work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Amex in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.
Why does Amex have black bars on iPhone Duo?
Apps built with the iOS 26 SDK or earlier run in a phone-sized window on the inner display, and iOS 27 builds can still leave some space empty. The bars disappear once the developer rebuilds the app with the iOS 27.1 SDK — you only need to update the app.
When will Amex fill iPhone Duo's inner display?
When its developer releases an update built with the iOS 27.1 SDK or later. We read the SDK of every new version of Amex within about a day of its release and update this page.
What can I do about the black bars until then?
Use Amex on the outer display, where it works like on any iPhone, or put it in Split View next to another app on the inner display so less of the screen goes unused.