Does WEBTOON work on iPhone Duo?

Yes. Apple lists WEBTOON among the apps adapted to iPhone Duo's inner screen (October 22, 2026).

See it on the App Store
On iPhone Duo
Adapted
Developer
NAVER WEBTOON Ltd.
Category
Entertainment
Current version
26.101.0 · October 19, 2026
App Store rating
4.8 out of 5 (515,802 ratings)
Last checked

How we know

Apple or the developer says the app is built for iPhone Duo's inner screen. Apple's announcement

History on iPhone Duo

Other Entertainment apps on iPhone Duo

All apps on iPhone Duo in the US →

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Good to know

Does WEBTOON work on iPhone Duo?

Yes. Apple lists WEBTOON among the apps adapted to iPhone Duo's inner screen (October 22, 2026).

Why do some apps have black bars on iPhone Duo?

Because they were built before Apple's iPhone Duo tools. On the inner screen, an app built for an older iOS opens in an iPhone-size window on a black background; one built for iOS 27.0 uses more of it but leaves some space blank; only apps built with the iOS 27.1 SDK, which developers have had since October 5, 2026, use the whole display.

Do apps that aren't adapted still work on iPhone Duo?

Yes. Every iPhone app runs on iPhone Duo: one that isn't adapted just doesn't fill the inner screen until its developer updates it.

How we measure

Sources: Apple's list of apps adapted to iPhone Duo (October 22, 2026) and each app's App Store record (version, release date, release notes, description). Apple doesn't say which tools an app was built with, so an app stays “Updated, unconfirmed” until its developer says more.