Business · v26.09.30
Does Slack work on iPhone Duo?
Yes. Slack is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Split View
- Supported
- Every app, automatically
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v26.09.30
- Sep 16, 2026
- Duo in release notes
- Not yet
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
Apple highlighted Slack bringing a whole workspace into view on the inner display — channels and conversation side by side, as on iPad.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Slack. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later. Slack stays fully usable at half width.
Duo-specific features
- Adaptive layoutRearranges into sidebars or multiple panes on the inner display instead of just stretching.
- Great in Split ViewStays fully usable at half width next to another app.
Evidence & history
Apple ·
Apple unveils iPhone Duo (Apple Newsroom)
Apple describes Slack bringing a user’s whole workspace into view.
- : Not confirmed yet → Built for Duo — Featured in Apple’s iPhone Duo announcement
Latest release notes
Version 26.09.30 · Sep 16, 2026
Bug Fixes • Hard work is happening this week, but nothing we can easily describe. It’s like a duck swimming on a pond. Under the water, the duck is paddling furiously, but on top all that can be seen is the gentle gliding of a bird on water. This week, Slack is the duck.
Questions
Does Slack work on iPhone Duo?
Yes. Slack is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does Slack work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Slack in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.