More of Slack and more of your messages on screen at once when iPhone Duo opens.
Does Slack work on iPhone Duo?
Yes. Apple named Slack among the apps already taking advantage of iPhone Duo's folding design: open the phone and Slack shows your whole workspace at once. iPhone Duo went on sale October 23.
- Launch partnerNamed by Apple as an iPhone Duo launch partner.
Adapted for the fold
- Open · Inner display
The whole workspace
Open, the 7.6″ inner display shows more of Slack at once, more of the app and more messages, in a layout closer to Slack on iPad.
About Slack
Apple named Slack among the third-party apps already taking advantage of iPhone Duo’s folding design, alongside Netflix and Zoom. In Apple’s words, the Slack app “brings a user’s whole workspace into view” on the 7.6-inch inner display. Engadget, covering the launch, describes Slack showing more of its interface and more messages when the phone is open, the way apps lay out on iPad.
That is the pattern Apple recommends for apps full of lists and conversations: with more room, the tab bar becomes a sidebar and you see more than one level of the app at a time.
iPhone Duo went on sale on October 23, after pre-orders from October 16. We haven’t seen screenshots of the Duo layout from Slack itself yet, and we’ll add them here when they appear.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Official announcement reviewed
Launch partner · iphone-duo
Apple names Slack among adapted apps and shows its workspace on the inner display.
Poses shown: Open. These are observations of the evidence, not a test of every interaction.
App version: Not recorded in this evidence.
Partner status is documented; individual interactions and folding transitions have not been tested by FoldHunt.
View reviewed evidence ↗
Coverage
Related guides
Adapt your app for iPhone Duo with a coding agent
Adapt an iOS app for iPhone Duo with Claude Code or Codex: script the Xcode 27.1 simulator to fold, rotate and screenshot it, and use measured layout rules.
iPhone Duo app ideas: 6 things builders are doing with the fold
Over 700 demos, concepts and prototypes for iPhone Duo, sorted into the six patterns that keep coming up, from the half-folded laptop to the hinge as a controller. A starting point if you're deciding what to build.
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.
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Sources: Apple unveils iPhone Duo — Apple Newsroom (apple.com) · Developers bring incredible new app experiences to iPhone Duo — Apple Newsroom (apple.com)
More for iPhone Duo
Things 3
Cultured Code
Cultured Code's to-do app, with a sidebar of your lists when the Duo opens
Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The App Store release notes for version 3.25.1 (released October 22, 2026) say: "Things is ready for iPhone Duo! We’ve tailored the app for the new device, with a dynamic layout for all poses, a sidebar for your lists, and more."
- Open
- Closed
- Book
- Split View
WPS Office
Kingsoft Office
Kingsoft's office suite: more rows and columns open, and AI beside your document
Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The China App Store release notes for version 26.10.1 (released October 23, 2026) describe full iPhone Duo support: navigation that changes with the fold, more of a spreadsheet on the open phone, several documents on screen, and AI beside a document.
- Closed
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Tiimo
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Visual planner: the day's plan on the cover, a timer beside your notes when propped up
Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The App Store release notes for version 3.70.1 (released October 21, 2026) don't mention the Duo.
- Closed
- Standing