Does Smash Fest! work on iPhone Duo?
It works, but with black bars. Smash Fest! 797 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 797, read Nov 3, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v797
- Nov 2, 2026
- Duo in release notes
- Not yet
About Smash Fest!
Smash Fest! is made by Flow Games Bilisim Yazilim ve Pazarlama Anonim Sirketi and first came out on the App Store in December 2025. It's #27 on today's US App Store top charts. It has 575,564 ratings on the US App Store, averaging 4.7 stars. Version 797 came out on Nov 2, 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, Smash Fest! is #52 of them.
From its App Store listing:
Welcome to Smash Fest! Get ready for the most explosive festival in town! Step into a colorful arena where every shot counts — fire your cannon, smash through fragile jars, break apart heavy stones, and watch the chaos unfold in the most satisfying way. Each level is a brand-new challenge. Adjust your angle, power, and timing to create the perfect launch. One clean shot can trigger a chain of dest…
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 Smash Fest!. 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 797 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 797 · Nov 2, 2026
Bug fixes and improvements
Questions
Does Smash Fest! work on iPhone Duo?
It works, but with black bars. Smash Fest! 797 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Smash Fest! 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 Smash Fest! 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 Smash Fest! 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 Smash Fest! 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 Smash Fest! within about a day of its release and update this page.
What can I do about the black bars until then?
Use Smash Fest! 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.