Mattel Game Studios HK Limited
Games v1.1.5
Does UNO! work on iPhone Duo?
It works, but with black bars. UNO! 1.1.5 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 1.1.5, read Oct 26, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v1.1.5
- Oct 21, 2026
- Duo in release notes
- Not yet
About UNO!
UNO! is made by Mattel Game Studios HK Limited and first came out on the App Store in November 2018. It has 659,835 ratings on the US App Store, averaging 4.7 stars. Version 1.1.5 came out on Oct 21, 2026 and needs iOS 14.0 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, UNO! is #46 of them.
From its App Store listing:
UNO!™ is now mobile! Take the classic card game from the kitchen table anywhere! Now with new rules, world series tournaments, modes of play, and much more. Whether you’re at home, on the go, an UNO!™ veteran or completely new, UNO!™ has something for everyone in the family. UNO!™ is a fun and memorable family-friendly card game wherever and whenever. Ready. Set. UNO!™ - Play the classic card game…
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 UNO!. 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 1.1.5 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 1.1.5 · Oct 21, 2026
New! Pet System 10.23: An adorable pup is joining your UNO! Mobile adventure! Build a bond, style them up, and let them tag along for UNO matches! New Season - Jolly Journey 11.2-12.27: All aboard for a whimsical ride through a wintry wonderland! 11.16-12.13: Joliday Journey Canvas New! UCS Reverse 11.12-11.19: A new UCS Contest available for all players featuring Wild rules! New! Shiny Cards Collect new ultra-rare Shiny Cards, available to catch on weekends once you collect 140+ Cards!
Questions
Does UNO! work on iPhone Duo?
It works, but with black bars. UNO! 1.1.5 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does UNO! 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 UNO! 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 UNO! 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 UNO! 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 UNO! within about a day of its release and update this page.
What can I do about the black bars until then?
Use UNO! 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.