Best reading apps for iPhone Duo

Apple's Craig Federighi told MKBHD that the iPhone Duo is "extraordinary to open up" for reading, per 9to5Mac. The catch is that most big reading apps haven't said anything about the Duo yet. This guide covers books, PDFs and news; streaming, games and the Inoreader RSS app are in the best apps for iPhone Duo guide, and work apps are in productivity apps. Prices are as of Nov 4, 2026.

How to tell if a reading app is ready

Look for the "Made for iPhone Duo" label on the App Store. Apps built with the iOS 27.1 SDK or later are optimized, per MacTrast, while apps built with the iOS 26 SDK or earlier still run but sit centered on the inner display with empty space around them.

Reading next to a notes app works in Split View, but each app gets exactly half of the 7.6-inch inner display, and iThinkDifferent reports the divider can't be dragged. More on that: how to use Split View on iPhone Duo.

Books

Apple Books

Apple Books is free, and its App Store listing names iPhone Duo among compatible iPhones. Mrwhosetheboss contrasted Books and Netflix with YouTube, which showed black bars on the inner display (his review summary). 9to5Mac reported that iOS 27.2 beta 3 reworked the Books reader with progress bars and a standalone bookmark button, and guessed the changes likely anticipate the Duo. The limitation: no source checked for this guide describes a two-page book spread in Apple Books on the Duo.

CalibReader

CalibReader is free to download from developer Gram 1 LLC and requires iOS 26.2 or later, per its App Store listing. The developer says opening the iPhone Duo turns a book into a two-page spread, closing it shows the book's cover on the outer display, and turning the open phone to portrait gives a single page. PDFs open as two-page spreads too, and the app works with calibre libraries, iCloud Drive, Dropbox, OneDrive and SMB. You can read any three books free, then unlock your whole library with one in-app purchase, with no subscription. The limitation: CalibReader reads only DRM-free EPUB and PDF files, so books bought in Kindle or Apple Books stay in those apps.

Kindle

Amazon's Kindle app is free on the App Store, and it also runs on iPad and Mac. Its latest notes say only "Several Bug fixes and improvements," and the listing doesn't mention iPhone Duo. The limitation: Amazon hasn't said whether Kindle adapts to the inner display, so check for the Duo label before relying on it.

Libby

Libby lends ebooks, audiobooks and magazines from your local library for free once you sign in with a library card, per OverDrive. Libby's App Store listing is free, and version 9.2.7 lists only bug fixes, with no mention of iPhone Duo. The limitation: you need a library card, and your library picks the catalog.

PDFs and documents

PDF Expert

Readdle's 7.26.3 update (Oct 22) calls PDF Expert "ready for iPhone Duo from day one," and the App Store listing promises full pages when unfolded and two PDFs side by side. Premium costs $79.99 a year for iPhone, iPad and Mac on Readdle's pricing page. Planning to annotate? See Apple Pencil on iPhone Duo. The limitation: the $139.99 lifetime plan covers the Mac version only; for iPhone, Readdle's pricing page lists the $79.99 yearly plan.

Adobe Acrobat Reader

Acrobat Reader is free, and Adobe's App Store listing shows subscriptions from $3.99 to $14.99 a month, plus Acrobat Premium at $69.99 a year. Version 25.08.03 says only "Better performance, improved stability." The limitation: the listing doesn't mention iPhone Duo, so Adobe hasn't documented any Duo layout.

Files and Quick Look

Before launch, 9to5Mac reported a leaked video from pdfu showing Quick Look opening PDFs as a two-page spread in the open-book position. iThinkDifferent noted that Apple's iPhone Duo announcement doesn't mention Quick Look. The limitation: this comes from a pre-launch leak, not Apple documentation, so treat it as reported.

News and read-later

Apple News

Apple News is free, and Apple News+ costs $12.99 a month after a one-month free trial for new subscribers, per Apple's News+ page. It's also in Apple One Premier at $39.95 a month. The limitation: Apple's page doesn't describe an iPhone Duo layout for News.

Readwise Reader

Version 8.27 (Oct 27) adds "Preliminary iPhone Duo Support," per Reader's App Store listing, and the full notes describe a two-column reading view when the phone is open. Reader alone is $7.99 a month and full Readwise is $9.99 a month, both billed yearly, with a 30-day trial on Readwise's pricing page. The limitation: Readwise calls the Duo support preliminary and says more improvements are planned.

Reeder

Reeder 2026.11.1 adds "Initial support for iPhone Duo," per Reeder's App Store listing. It's free, with subscriptions at $1.99 a month or $14.99 a year. The limitation: the notes don't describe what changes on the inner display.

Keep the page readable

Apple's spec page lists a nano-texture finish on the inner display and an anti-reflective coating on both displays. Before wiping it, read how to clean the inner screen and what the nano-texture layer is.

Bottom line

For PDFs, PDF Expert has the clearest Duo commitment. For articles, Readwise Reader is the one with a described Duo layout, and Reeder is the low-cost feed reader. For books, Apple Books is the starting point, CalibReader has a described two-page spread for DRM-free files, and Kindle and Libby work for their libraries but haven't announced Duo changes. We'll update this guide as more reading apps add iPhone Duo support. Which reading app do you open first?