Business v26.11.10
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
- Built with
- Not read yet
- We read each app's build SDK after it updates
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v26.11.10
- Nov 4, 2026
- Duo in release notes
- Not yet
About Slack
Slack is made by Slack Technologies, Inc. and first came out on the App Store in March 2013. It has 54,964 ratings on the US App Store, averaging 4.1 stars. Version 26.11.10 came out on Nov 4, 2026 and needs iOS 17.5 or later. It's free to download. Among the 46 productivity apps we track on the US App Store, 28 already fill the inner display, 3 are partly adapted and 15 still show black bars. By number of ratings, Slack is #31 of them.
From its App Store listing:
Companies in every industry around the world grow their business in Slack because it gets busywork off their plates and wasteful meetings off their calendars. Slack brings everyone from coworkers, customers, and contractors into one secure place, so you don’t have to chase approvals or wait around on emails. Slack even has AI that can search to find the information you need instantly and summarize…
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 named it in its iPhone Duo launch roundup on October 22: it brings a full workspace into view to follow channels and automate tasks.
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.
Apple,
Developers bring incredible new app experiences to iPhone Duo (Apple Newsroom)
Apple says it brings a full workspace into view to follow channels and automate tasks.
App build,
Version 26.10.40 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
- : Not confirmed yet → Built for Duo — Featured in Apple’s iPhone Duo announcement
Latest release notes
Version 26.11.10 · Nov 4, 2026
Bug Fixes • We cleaned the code to make sure that everything’s running smoothly. Slack — now with a streak-free shine.
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.