Book v9.2.7
Does Libby, the library app work on iPhone Duo?
It works, but with black bars. Libby, the library app 9.2.7 is built with the iOS 26.5 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
At a glance
- Inner display (7.6″)
- Black bars
- Outer display (5.4″)
- Works normally
- Built with
- iOS 26.5 SDK
- Version 9.2.7, read Nov 1, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v9.2.7
- Oct 30, 2026
- Duo in release notes
- Not yet
About Libby, the library app
Libby, the library app is made by OverDrive, Inc. and first came out on the App Store in December 2016. It has 4,601,589 ratings on the US App Store, averaging 4.9 stars. Version 9.2.7 came out on Oct 30, 2026 and needs iOS 13.0 or later. It's free to download. Among the 30 utilities & lifestyle apps we track on the US App Store, 9 already fill the inner display, 3 are partly adapted and 18 still show black bars. By number of ratings, Libby, the library app is #6 of them.
From its App Store listing:
Libby connects you to your local library’s collection of ebooks, audiobooks, magazines, and more. With just your library card, you can instantly read or listen to books on your phone or tablet — for free, thanks to your public library! Browse and borrow everything from timeless classics to the latest New York Times bestsellers, and enjoy your next great read anytime, anywhere. What You Can Do with…
On the inner display
Apps built with older SDKs are placed in a phone-sized safe area on a black background. Everything works; you just don't get the bigger screen.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Libby, the library app. 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 9.2.7 is built with the iOS 26.5 SDK
Apple runs apps built with the iOS 26 SDK or earlier in a phone-sized window on the inner display.
- : Not confirmed yet → Black bars — built with the iOS 26.5 SDK
Latest release notes
Version 9.2.7 · Oct 30, 2026
We have some important bug fixes in this release.
Questions
Does Libby, the library app work on iPhone Duo?
It works, but with black bars. Libby, the library app 9.2.7 is built with the iOS 26.5 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Libby, the library app 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 Libby, the library app 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 Libby, the library app 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 Libby, the library app 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 Libby, the library app within about a day of its release and update this page.
What can I do about the black bars until then?
Use Libby, the library app 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.