Book v26.102.0
Does SERIES work on iPhone Duo?
Yes. SERIES is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Built with
- iOS 27.1 SDK
- Version 26.102.0, read Oct 24, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v26.102.0
- Oct 22, 2026
- Duo in release notes
- Not yet
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
Apple named it in its iPhone Duo launch roundup on October 22: it shows books on the larger display.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including SERIES. 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
- Adaptive layoutRearranges into sidebars or multiple panes on the inner display instead of just stretching.
Evidence & history
Apple,
Developers bring incredible new app experiences to iPhone Duo (Apple Newsroom)
Apple says it shows books on the larger display.
App build,
Version 26.102.0 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
- : Not confirmed yet → Built for Duo — Named in Apple’s iPhone Duo launch roundup
Latest release notes
Version 26.102.0 · Oct 22, 2026
[v.26.102.0] 시리즈를 이용해주셔서 감사합니다. 이번 버전 업데이트 내용은 다음과 같습니다. - 사용성 개선 및 기타 오류가 해결되었습니다.
Questions
Does SERIES work on iPhone Duo?
Yes. SERIES is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does SERIES 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 SERIES 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.