Is it Duo-ready?
iPhone Duo is out: see which apps are ready →

For iPhone Duo owners

Is your app ready for the big screen?

Apps that haven't been updated for Duo don't use the whole inner display, and older ones open in a smaller window with empty space around it. Check the apps you rely on, and report what you see so others know too.

Got a Duo? Report your apps in a minute →

Any App Store app, even if it isn't listed yet · 7388 apps tracked · 441 community reports

This week's goal: 220 reports

3 days left

53 of 220 owner reports this week, 167 to go. Add yours →

For ownersCheck any app →Search for an app to see whether it uses the whole inner display yet, what Apple and its developer have said, and what owners report.For developersGet a live status badge →Show your app's iPhone Duo status in your README or on your website. It updates by itself.Update trackerWho has updated for Duo? →Every App Store update since Apple opened Duo submissions, and every release note that mentions iPhone Duo.

Where things stand

193 of 7388 apps have a report

Monthly report
77
Built for Duo
Uses the full inner display with a layout designed for it, and adapts when you fold, unfold or prop the phone half-open.
32
Fills the screen
Uses all or most of the inner display, but with a stretched iPhone layout rather than one designed for Duo.
80
Letterboxed
Runs in a smaller window in the middle of the inner display, with empty space around it. The app hasn't been updated for Duo yet.
4
Broken
Crashes, freezes or is unusable on iPhone Duo.

Recently reported

Browse all
Instagram
Instagram, Inc.
Letterboxed · 10 reports
Letterboxed
Apple Podcasts
Apple
Optimized · 1 report
Built for Duo
Sonos
Sonos, Inc.
Optimized · 1 report
Built for Duo
LinkedIn
LinkedIn Corporation
Letterboxed · 14 reports
Letterboxed
ChatGPT
OpenAI OpCo, LLC
Optimized · 18 reports
Built for Duo
Bloons TD 6
Ninja Kiwi
Letterboxed · 2 reports
Letterboxed
Snapchat
Snap, Inc.
Letterboxed · 27 reports
Letterboxed
Microsoft Teams
Microsoft Corporation
Letterboxed · 22 reports
Letterboxed

App Store updates

4334 of 7388 apps updated since Apple opened Duo submissions on Oct 5

See all
  • nPlayer Plus 3.14.1: “Added support for iPhone Duo”
  • 2AM CAM 2.4.7: “Designed for iPhone Duo: new layouts for the folded and open screens, with every control in easy reach along the side.”
  • SPassPort 1.3.0: “iPhone Duo: on the inner display, the start screen and the review each spread across both pages, with a step-by-step guide beside the form.”

Most wanted

Apps people are waiting on

See the board
Microsoft Teams
30 people waiting
Letterboxed · 22 reports
Letterboxed
Snapchat
23 people waiting
Letterboxed · 27 reports
Letterboxed
LinkedIn
14 people waiting
Letterboxed · 14 reports
Letterboxed
Clash Royale
12 people waiting
Letterboxed · 2 reports
Letterboxed

Questions about apps on iPhone Duo

Why do some apps show black bars on iPhone Duo?

Apps built before iOS 27 open in a smaller window in the middle of the inner display, with empty space around it. This is called letterboxing. Apps built with the iOS 27 SDK fill most of the display but leave space by the status bar, and only apps rebuilt with the iOS 27.1 SDK use the whole display.

Can iPhone Duo run the iPad version of an app instead?

No. Unlike some other foldable phones, iPhone Duo doesn't fall back to an app's iPad version. Each app needs an update from its developer to use the inner display.

What's the difference between “Built for Duo” and “Fills the screen”?

“Fills the screen” means the app runs full-screen on the inner display but uses a stretched iPhone layout. “Built for Duo” means the app has a layout designed for the inner display, such as a list beside the content, and adapts when you fold or half-fold the phone.

How is an app's status decided?

It comes from reports by iPhone Duo owners. The status is the one most recent reports agree on: only reports from the last 30 days count, and newer ones count more, because an app update can change the answer overnight.

Is this site made by Apple?

No. Is it Duo-ready? is an independent community project and isn't affiliated with or endorsed by Apple Inc.