A PDF reader and editor that shows two facing pages on the open Duo
Does PDF Editor ,PDF Book Reader ® work on iPhone Duo?
Yes, the developer says so: version 13.8 shows PDFs as two facing pages on the open Duo and adapts as the phone folds or opens. The current version is 14.1.
- App Store confirmedThe developer, in the App Store release notes for version 13.8 (released October 10, 2026): open, PDFs show as two facing pages, and the layout adapts as the phone folds or opens. The current version, 14.1, came out October 18, 2026, and says reading, the library and the subscription screen fit both the folded and unfolded display.
Adapted for the fold
We're waiting on details of exactly what PDF Editor ,PDF Book Reader ® changes for the fold. Are you the developer? Tell us.
About PDF Editor ,PDF Book Reader ®
PDF Editor, PDF Book Reader reads, edits and scans documents and keeps them organized. Version 13.8 adds iPhone Duo support, the release notes say: open, PDFs show as two facing pages, and the layout adapts as the phone folds or opens.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· App Store page reviewed
App Store confirmed · iphone-duo
The App Store release notes for version 14.5 (released October 23, 2026) mention iPhone Duo: "Optimized for iPhone Duo"
App version: 14.5.
Store text only: we haven't seen the app running, and the store page doesn't show how each pose is used.
View reviewed evidence ↗
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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.
Is this your app?
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Sources: PDF Editor, PDF Book Reader on the App Store (apps.apple.com) · PDF Editor, PDF Book Reader in Apple's App Store records (itunes.apple.com)
More for iPhone Duo
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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Calc Pro - The Best Calculator
Panoramic Software Inc.
Ten calculators and converters, with the tape of results beside the calculator when open
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
Tyler Hillsman / 1881 Digital, LLC
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