Every app worth opening on both screens of iPhone Duo.
We test, rank, and explain the apps, tools, and settings built for iPhone Duo's fold — plus plain-English tutorials for getting the most out of dual-screen multitasking.
New from us: PromptSlate Studio, a script, teleprompter and camera app — out now on the App Store (opens in a new tab).
What is iPhone Duo, and why does it need its own app guide?
iPhone Duo is Apple's foldable iPhone, built around a single 7.6-inch inner display that folds flat into a pocketable device with a 5.4-inch outer display. That hinge changes how software should behave: an app that hasn't been rebuilt for it just runs boxed in with black bars, while an app designed for the fold can turn Split View's second pane into a real workspace — a sketch app can keep your reference photos off the canvas, a calendar app can accept a task dragged straight off your to-do list.
Apps for Duo exists because most App Store listings don't tell you which of those two categories an app falls into. We research and write up every app and update with the fold specifically in mind, cross-checking claims against Apple's own developer documentation, and publish plain-English tutorials for getting more out of Duo's multitasking, settings, and developer tools. Coverage published before launch is clearly labeled as pre-launch research rather than hands-on testing — Apps for Duo is not affiliated with, endorsed by, or sponsored by Apple.
Start here
- Browse the iPhone Duo apps directory
Every app we've researched, ranked by fold quality.
- Read setup guides and reviews
Tutorials, workflows, and researched guides.
- New iPhone Duo? The best apps to install first
Our starter list, plus 21 more best-apps guides below.
- The best free apps for iPhone Duo
15 genuinely useful apps that cost nothing.
- Film yourself on the fold
The best apps for tabletop recording and teleprompting.
- PromptSlate Studio: our teleprompter camera app
Out now on the App Store (opens in a new tab), $9.99 one-time. Read the 10-part devlog.
- Building for Duo? Start with iOS 27
Our developer guide to the current beta stack.
Editor's picks
Apps that make the most of the fold.
Best apps for iPhone Duo
Hand-picked lists for every kind of iPhone Duo owner, from cameras and editors to productivity.
- New iPhone Duo? 12 best apps to install first
- 10 best camera apps for iPhone Duo
- 5 best teleprompter apps for iPhone Duo
- 8 best video editing apps
- 10 best apps for YouTubers
- 9 best apps for TikTok and Reels
- 6 best audio recording apps
- 11 best productivity apps
- 7 best apps for writing video scripts
- 6 best live streaming apps
- 15 best free apps for iPhone Duo
- Must-have iPhone Duo apps
- 9 best AI apps for iPhone Duo
- 8 best photo editing apps
- 9 best note-taking apps
- 10 best apps for students
- 7 best presentation and public speaking apps
- 8 best podcast apps
- 6 best apps to record yourself
- 8 best vlogging apps
- 12 best games for iPhone Duo
- 7 best widget and home screen apps
Building PromptSlate Studio
Our 10-part devlog on designing a teleprompter camera app for the fold.
- Part 1Why a foldable changes the camera app
- Part 2Compact, expanded and tabletop layouts
- Part 3The AVFoundation camera engine
- Part 4A teleprompter with steady speed
- Part 5Following the speaker's voice
- Part 6A teleprompter on the outer display
- Part 7On-device script writing
- Part 8Image context for script AI
- Part 9Storing projects and takes
- Part 10Shipping for iOS 27.1
The iPhone Duo guide
Plain-English answers to what people search most about iPhone Duo, sourced from Apple's spec sheet.
Before you buy
Everyday use
Features and AI
Recording yourself on iPhone Duo?
PromptSlate Studio keeps your script, teleprompter and camera in one workspace built for the fold. Out now on the App Store — $9.99 one-time.
From the Learn hub
Reviews, tutorials, and Duo news.
Duo Preview, Smart Take, and Kid Cue: How iPhone Duo Changes the Photo Workflow
Apple’s new camera features use the outer display to involve the subject, automate timing, and make group photos less awkward. Here is what each one does.
Nov 2, 2026
iPhone Duo Size and Weight: What 254 Grams Means in Daily Use
Apple publishes exact open and closed dimensions for iPhone Duo. We translate those numbers into realistic grip, pocket, desk, and one-handed-use expectations.
Nov 2, 2026
Apple Pencil on iPhone Duo: What Apple Confirmed—and What Is Still Open
Apple lists Apple Pencil (USB-C) support for iPhone Duo. The compatibility is confirmed, but several workflow details still need clearer answers.
Nov 2, 2026
Is iPhone Duo Worth It? Who Should Buy Apple’s Foldable iPhone
A practical buying guide to iPhone Duo for multitaskers, readers, creators, travelers, and anyone choosing between Apple’s foldable and a conventional Pro iPhone.
Sep 24, 2026Will the crease be visible on iPhone Duo? What the nano-texture finish actually does
The most common question we are seeing ahead of launch. Here is what Apple has said, what early hands-on impressions suggest, and what is still unverified.
Sep 21, 2026
iOS 27, Xcode 27.1 beta, and macOS Tahoe 26.6: what Duo developers need to know
A practical rundown of the current developer beta stack for iPhone Duo: what's new in iOS 27 for dual-screen apps, what Xcode 27.1 beta requires, and why macOS Tahoe 26.6 matters for your build machine.
Sep 21, 2026Got a tip, an app to suggest, or a project to build?
Spotted an app that nails the fold, found something we got wrong, or need a developer for your own iPhone, web, or automation project? We read every message ourselves.
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