Music v9.44
Does YouTube Music work on iPhone Duo?
It works, but with black bars. YouTube Music 9.44 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 9.44, read Nov 3, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v9.44
- Nov 1, 2026
- Duo in release notes
- Not yet
About YouTube Music
YouTube Music is made by Google and first came out on the App Store in November 2015. It's #16 on today's US App Store top charts. It has 1,516,138 ratings on the US App Store, averaging 4.8 stars. Version 9.44 came out on Nov 1, 2026 and needs iOS 17.0 or later. It's free to download. Among the 9 music & audio apps we track on the US App Store, 4 already fill the inner display, 1 are partly adapted and 4 still show black bars. By number of ratings, YouTube Music is #6 of them.
From its App Store listing:
Connecting you to the world of music: ● Music content including live performances, covers, remixes and music content you can’t find elsewhere ● Thousands of curated playlist across many genres and activities Get personalized music, perfect for every moment: ● Personalized playlists and Mixes ● Activity mixes made for you ● Create playlists with song suggestions or collaborate with other music fans…
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 YouTube Music. 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 9.44 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 9.44 · Nov 1, 2026
We update our app all the time in order to make your YouTube Music experience better. We polished a few things, fixed bugs, and made some performance improvements.
Questions
Does YouTube Music work on iPhone Duo?
It works, but with black bars. YouTube Music 9.44 is built with the iOS 26.4 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does YouTube Music 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 YouTube Music 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 YouTube Music 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 YouTube Music 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 YouTube Music within about a day of its release and update this page.
What can I do about the black bars until then?
Use YouTube Music 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.