Games v1.0.9
Does Rap Star work on iPhone Duo?
It works, but with black bars. Rap Star:Idle Clicker 1.0.9 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 1.0.9, read Oct 26, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v1.0.9
- Oct 14, 2026
- Duo in release notes
- Not yet
About Rap Star
Rap Star is made by 聪 马 and first came out on the App Store in April 2026. It has 52,021 ratings on the US App Store, averaging 4.8 stars. Version 1.0.9 came out on Oct 14, 2026 and needs iOS 15.0 or later. It's free to download. Among the 238 games we track on the US App Store, 34 already fill the inner display, 9 are partly adapted and 187 still show black bars. By number of ratings, Rap Star is #141 of them.
From its App Store listing:
From streets to stardom — tap, rap, earn, date, collect. Rap Star: Idle Clicker is a rap life simulator meets idle tycoon. Start with $1 and build your rap empire. Every tap rewrites your destiny. TAP TO RAP, STACK CASH Every tap is money. From freestyling on corners to sold-out stadiums, your rap career starts from zero. Invest in studios, unlock new flows, hire producers. Even offline, your hust…
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 Rap Star. 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 1.0.9 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 1.0.9 · Oct 14, 2026
bugs fix!
Questions
Does Rap Star:Idle Clicker work on iPhone Duo?
It works, but with black bars. Rap Star:Idle Clicker 1.0.9 is built with the iOS 26.5 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Rap Star:Idle Clicker 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 Rap Star:Idle Clicker 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 Rap Star:Idle Clicker 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 Rap Star:Idle Clicker 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 Rap Star:Idle Clicker within about a day of its release and update this page.
What can I do about the black bars until then?
Use Rap Star:Idle Clicker 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.