Productivity v5.4.1
Does 倒数日 · Days Matter work on iPhone Duo?
Yes. 倒数日 · Days Matter 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
- Not read yet
- We read each app's build SDK after it updates
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v5.4.1
- Oct 23, 2026
- Duo in release notes
- Mentioned
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.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including 倒数日 · Days Matter. 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
Release notes,
Release notes for version 5.4.1
全新支持 iPhone Duo 折叠屏 - 展开内屏可获得更大空间 - 倒数日内页支持帐篷模式，与你随时相伴 - 全新 iOS 27 超大号小组件，让你的重要日期格外醒目
- : Not confirmed yet → Built for Duo — release notes for 5.4.1 say it supports iPhone Duo
Latest release notes
Version 5.4.1 · Oct 23, 2026
全新支持 iPhone Duo 折叠屏 - 展开内屏可获得更大空间 - 倒数日内页支持帐篷模式，与你随时相伴 - 全新 iOS 27 超大号小组件，让你的重要日期格外醒目
Questions
Does 倒数日 · Days Matter work on iPhone Duo?
Yes. 倒数日 · Days Matter is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does 倒数日 · Days Matter 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 倒数日 · Days Matter 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.