Notes, lists and tasks organized into outlines, updated for the Duo
Does Outliner work on iPhone Duo?
Yes, the developer says so: the App Store release notes for version 3.21 of Outliner mention iPhone Duo support.
- App Store confirmedThe developer, in the App Store release notes for version 3.21, which add iPhone Duo support without describing the layout.
Adapted for the fold
We're waiting on details of exactly what Outliner changes for the fold. Are you the developer? Tell us.
About Outliner
Outliner, from CarbonFin, organizes notes, lists and tasks into outlines. Version 3.21 adds iPhone Duo support, the release notes say, without describing a layout for the fold.
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 3.21 (released October 7, 2026) mention iPhone Duo: "iPhone Duo support"
App version: 3.21.
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
The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.
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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