A T9 keyboard for Apple Watch, its iPhone app adapted to both Duo displays
Does RetroBoard - T9 Watch Keyboard work on iPhone Duo?
Yes. RetroBoard - T9 Watch Keyboard's App Store page says it supports iPhone Duo, so the update is out. FoldHunt's editor hasn't seen it running yet.
- App Store confirmedThe developer, in the App Store release notes for version 5.3.1: content and toolbars are adjusted for the inner and outer displays. The notes don't say how.
Adapted for the fold
We're waiting on details of exactly what RetroBoard - T9 Watch Keyboard changes for the fold. Are you the developer? Tell us.
About RetroBoard - T9 Watch Keyboard
RetroBoard brings a T9 keypad to Apple Watch, with a companion app on the iPhone. Version 5.3.1 adjusts the iPhone app’s content and toolbars for both iPhone Duo displays, the release notes say, without describing the layouts.
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 5.3.2 (released October 21, 2026) mention iPhone Duo: "In this update: - Added full support for iPhone Duo."
App version: 5.3.2.
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 ↗· Developer statement reviewed
Developer claimed · iphone-duo
The iPhone companion adjusts content and toolbars for both Duo displays; the notes do not describe their positions.
App version: 5.3.1.
The developer's written claim only. No pictures or video of the app on the Duo were checked, and no build was tested.
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.
Is this your app?
Add the badge to your site or press kit. It links back to this page, where fans can upvote you.
<a href="https://foldhunt.com/apps/retroboard/"><img src="https://foldhunt.com/badges/featured-on-foldhunt.svg" alt="Featured on FoldHunt" width="220" height="54"></a>Need to update the listing? Email the editor.
Sources: RetroBoard - T9 Watch Keyboard on the App Store (apps.apple.com)
More for iPhone Duo
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
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
- Open
- Split View