A PDF reader that turns into a two-page spread when you unfold the phone
Does Highlights work on iPhone Duo?
Yes. Highlights's App Store page says it supports iPhone Duo, so the update is out. FoldHunt's editor hasn't seen it running yet.
- App Store confirmedThe developer, in the release notes for version 2026.3 (released October 10, 2026): "The iPhone Duo release with a whole new page layout mode called Auto where unfolding will automatically switch from single to two-page layout for a book-like experience." PDFs show edge to edge folded and unfolded, with the toolbar buttons floating in a vertical bar that hides when you tap the page, and on the inner display you can compare two documents side by side in separate windows. There are no pictures of it on the Duo yet. The App Store seller is Jonas Myren Ribe (id 1498912833).
Adapted for the fold
- Open · Inner display
One page becomes two
Unfold the phone and the Auto page layout switches from one page to a two-page spread.
- Closed · Outer display
Edge to edge on the cover
Closed, the PDF fills the cover edge to edge, with the toolbar floating at the side.
About Highlights
Highlights is a PDF reader for research: highlight and annotate, then export your notes. Version 2026.3 is its iPhone Duo release, the release notes say. A new Auto page layout switches from one page to two when you unfold the phone, like a book. Folded or open, PDFs run edge to edge, and the toolbar floats in a vertical bar that hides when you tap the page; open, you can also put two documents side by side in separate windows. There are no pictures of it on the Duo yet.
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 2026.3.1 (released October 19, 2026) mention iPhone Duo: "The iPhone Duo release with a whole new page layout mode called Auto where unfolding will automatically switch from single to two-page layout for a book-like experience."
App version: 2026.3.1.
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 ↗
Related guides
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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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