Tsinghua course access, with its two-pane layout back on for the open Duo
Does learnX - THU Web Learning work on iPhone Duo?
Yes, the developer says so: version 18.0.0, released October 15, 2026, adds iPhone Duo support and turns the two-pane layout back on.
- Developer claimedThe developer, in a change to the learnX code on GitHub on October 14, 2026, titled "Re-enable native split view on iPhone Duo", which lifts the restriction of the two-pane layout to iPad and Mac. The App Store release notes for version 18.0.0 (released October 15, 2026) add support for iPhone Duo.
Adapted for the fold
- Open · Inner display
Two-pane navigation is back
The code change allows the app's sidebar-and-detail layout on the iPhone Duo, rather than only on iPad and Mac.
About learnX - THU Web Learning
learnX helps Tsinghua University students read course notices, open course files and keep track of assignments. An October 14 change to its code turns the two-pane layout back on for the iPhone Duo, and version 18.0.0, released October 15, adds support for iPhone Duo, the release notes say. They don’t describe the layout.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Developer statement reviewed
Developer claimed · iphone-duo
Read the App Store release notes for version 18.0.0, released October 15, 2026, which add support for iPhone Duo. The notes don't describe the layout.
App version: 18.0.0.
Text evidence only: no Duo screenshots or recording reviewed, and no build tested.
View reviewed evidence ↗· Developer statement reviewed
Developer claimed · iphone-duo
Read the October 14 commit titled "Re-enable native split view on iPhone Duo." It removes the restriction that limited the app's two-pane navigation to iPad and Mac.
App version: Not recorded in this evidence.
Code change and developer statement only; no build, screenshots or recordings reviewed. At the time, the US App Store listed 17.1.0, from September 15. The app is for Tsinghua University students.
View reviewed evidence ↗
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Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
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Sources: learnX re-enables split view on the Duo, on GitHub (github.com) · learnX on the App Store (apps.apple.com)
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KeepCount
Tyler Hillsman / 1881 Digital, LLC
A board of tally counters: half-folded, counts sit above the fold and the buttons below
Simulator verified: Tyler Hillsman, the developer, in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (keepcount.app). The App Store seller is 1881 Digital, LLC. The release notes for version 1.8 (released October 12, 2026) say KeepCount now adapts to the iPhone Duo's inner and outer displays, with a tabletop layout when it's partly folded.
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Simulator verified: Panoramic Software Inc., the developer, in a submission to FoldHunt on October 18, 2026, and in the App Store release notes for version 7.0.6 (released October 12, 2026), which describe the closed and open layouts. The app's page on the developer's website has pictures of both on the iPhone Duo.
- Closed
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Sticky Widgets
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Sticky notes as widgets, with a larger library and side-by-side editing on the Duo
Simulator verified: Tyler Hillsman, the developer, in the App Store release notes for version 5.4.0 (released October 13, 2026), which add iPhone Duo support with a larger library and side-by-side editing, and in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (stickywidgets.app). The App Store seller is 1881 Digital, LLC; the App Store pictures show ordinary iPhones and iPads.
- Open