Private, end-to-end encrypted messaging. No iPhone Duo version announced yet.
Does Signal work on iPhone Duo?
Not announced yet. Signal hasn't said when Signal will get an iPhone Duo layout. It still opens on the Duo, but won't fill the inner display until it's updated.
- Not announcedNo announcement from Signal that we have found, and the current App Store release notes don't mention iPhone Duo.
Until it's updated
What an app does on iPhone Duo before its developer adapts it. Which of the open cases applies to Signal depends on the tools its current version was built with, and we haven't seen it on the device.
Closed
On the outer display it looks and works as it does on any iPhone.
Open, built with older tools
An app last built with Xcode 26 sits in an iPhone-shaped window on the inner display, with black borders around it.
Open, built for iOS 27
An app built with the iOS 27 SDK resizes to use more of the inner display, with some space left over.
Open, built for iOS 27.1
Only an app built with the iOS 27.1 SDK reaches the edges of the inner display and moves its bar buttons to the side. Apple calls that “optimized for iPhone Duo”.
About Signal
Signal has no announced version for iPhone Duo. As of October 6, 2026, the current App Store release is version 8.31, from October 1, and its release notes don’t mention the Duo. Signal has made no announcement that we have found.
A private messenger has one Duo question the others don’t: what the cover shows when a message arrives with the phone shut. Signal hasn’t said anything about the Duo. Telegram and WhatsApp are in the same position.
Signal will still open on iPhone Duo, like every app on the App Store. Closed, it looks as it does on any iPhone. Open, it won’t reach the edges of the inner display until Signal rebuilds it with Apple’s iOS 27.1 tools, which Apple only cleared for App Store submissions on October 5. The App Store lists an iPad version, so a layout for wider screens exists; nothing says the Duo will get it. More in how apps that aren’t updated run on iPhone Duo.
Know something we don't?
If Signal has announced or shipped a version for iPhone Duo, send us the link and we'll update this page the same day.
Sources: Signal - Private Messenger on the App Store (apps.apple.com)
More for iPhone Duo
Netflix
Netflix, Inc.
Clips on the outer screen, cinema on the inner one, redesigned for iPhone Duo.
Launch partner: Named by Apple as an iPhone Duo launch partner.
- Closed
- Open
- Book
- Standing
Detail
Detail Technologies
On-device AI video creation, built on the new Core AI framework.
Launch partner: Named by Apple as an iPhone Duo launch partner.
- Open
Slack
Slack Technologies
More of Slack and more of your messages on screen at once when iPhone Duo opens.
Launch partner: Named by Apple as an iPhone Duo launch partner.
- Open