Education v4.1.0
Does Learna work on iPhone Duo?
It works, but with black bars. Learna 4.1.0 is built with the iOS 26.1 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 26.1 SDK
- Version 4.1.0, read Oct 31, 2026
- iPad version
- No
- Phone-only layout today
- Latest version
- v4.1.0
- Oct 30, 2026
- Duo in release notes
- Not yet
About Learna
Learna is made by DEEP FLOW SOFTWARE SERVICES and first came out on the App Store in September 2024. It's #78 on today's US App Store top charts. It has 457,713 ratings on the US App Store, averaging 4.6 stars. Version 4.1.0 came out on Oct 30, 2026 and needs iOS 15.0 or later. It's free to download. Among the 6 education apps we track on the US App Store, 1 already fill the inner display, 0 are partly adapted and 5 still show black bars. By number of ratings, Learna is #5 of them.
From its App Store listing:
Ready to Speak English Confidently? Welcome to Learna AI English Tutor App, your all-in-one solution for mastering the English language! Learn English with grammar, speaking, reading, pronunciation, and vocabulary practices designed to enhance your proficiency in every aspect of the language. With Learna AI, you can speak English confidently and effectively through interactive conversations. Our a…
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 Learna. 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 4.1.0 is built with the iOS 26.1 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 26.1 SDK
Latest release notes
Version 4.1.0 · Oct 30, 2026
Learna AI is now better than ever! With fresh improvements, your learning journey is even more enjoyable. Update to the latest version and jump right back into your lessons. Keep learning, keep growing! -Greetings from Learna AI Team
Questions
Does Learna work on iPhone Duo?
It works, but with black bars. Learna 4.1.0 is built with the iOS 26.1 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Learna 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 Learna 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 Learna 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 Learna 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 Learna within about a day of its release and update this page.
What can I do about the black bars until then?
Use Learna 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.