Guangzhou Polar Future Culture Technology Co., Ltd
Education v14.55.0
Does Zuoyebang work on iPhone Duo?
It works, but with black bars. Zuoyebang 14.55.0 is built with the iOS 26.2 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 26.2 SDK
- Version 14.55.0, read Oct 28, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v14.55.0
- Oct 27, 2026
- Duo in release notes
- Not yet
About Zuoyebang
Zuoyebang is made by Guangzhou Polar Future Culture Technology Co., Ltd and first came out on the App Store in March 2014. It has 3,427 ratings on the US App Store, averaging 4.5 stars. Version 14.55.0 came out on Oct 27, 2026 and needs iOS 13.0 or later. It's free to download.
From its App Store listing:
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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 Zuoyebang. 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 14.55.0 is built with the iOS 26.2 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 26.2 SDK
Latest release notes
Version 14.55.0 · Oct 27, 2026
- 优化部分功能，让体验更流畅
Questions
Does Zuoyebang work on iPhone Duo?
It works, but with black bars. Zuoyebang 14.55.0 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Zuoyebang 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 Zuoyebang 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 Zuoyebang 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 Zuoyebang 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 Zuoyebang within about a day of its release and update this page.
What can I do about the black bars until then?
Use Zuoyebang 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.