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Book v6.43.0
Does 帆书-通勤听书，高效读懂经典 work on iPhone Duo?
It works, but with black bars. 帆书-通勤听书，高效读懂经典 6.43.0 is built with the iOS 26.4 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 26.4 SDK
- Version 6.43.0, read Oct 28, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v6.43.0
- Oct 23, 2026
- Duo in release notes
- Not yet
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 帆书-通勤听书，高效读懂经典. 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 6.43.0 is built with the iOS 26.4 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 26.4 SDK
Latest release notes
Version 6.43.0 · Oct 23, 2026
优化了一些体验，用起来更溜啦～ 寒露过后天慢慢凉了，正好把节奏放慢一点，想想什么值得做。 1. 内卷是一种恶性竞争，良性竞争创造价值，恶性竞争毁灭价值。——樊登讲书《反内卷》 2. 真正的危机不是亏损上百亿美元，而是所有人都相信大象只能倒下。——非凡精读《谁说大象不能跳舞》 3. 以前，是要知道生命是否有意义，值得我们活过。而此时，恰恰相反，正是因为生命很可能没有意义，它才值得更好地活过。——李蕾讲经典《西西弗神话》
Questions
Does 帆书-通勤听书，高效读懂经典 work on iPhone Duo?
It works, but with black bars. 帆书-通勤听书，高效读懂经典 6.43.0 is built with the iOS 26.4 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does 帆书-通勤听书，高效读懂经典 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 帆书-通勤听书，高效读懂经典 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 帆书-通勤听书，高效读懂经典 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 帆书-通勤听书，高效读懂经典 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 帆书-通勤听书，高效读懂经典 within about a day of its release and update this page.
What can I do about the black bars until then?
Use 帆书-通勤听书，高效读懂经典 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.