Best EPUB Reader for iPhone and iPad in 2026 — 6 Apps Compared

Your iPhone has more processing power than most Kindle e-readers, a better screen than any of them, and you carry it everywhere. But finding the right app to actually read ebooks on iOS is surprisingly frustrating.

Apple Books is pre-installed but treats sideloaded books as an afterthought. Kindle works great if you only buy from Amazon. Kobo is excellent if you are all-in on Kobo hardware. None of them handle the messy reality of a personal library with EPUBs from the Internet Archive, MOBIs from an old Calibre collection, and CBZ comics picked up from various places.

I tested six ebook readers on iPhone and iPad over the past month, reading the same books in each, importing the same files, and paying attention to the details that matter when you are actually sitting down to read. Here is what I found.

Quick Comparison

BookShelves - Best for Personal Libraries

BookShelves is a native iOS and macOS reader built for people who bring their own books. Where most reading apps assume you bought everything from one store, BookShelves assumes your library is a collection you built from many sources.

What sets it apart on iPhone and iPad:

• Multi-format. EPUB, PDF, MOBI, AZW, AZW3, FB2, CBZ, CBR, CB7. MOBI and AZW files are auto-converted to EPUB on import, no computer required. FB2 files (popular in Russian-language publishing) convert automatically too.
• iCloud sync across everything. Books, reading positions, highlights, and bookmarks sync between iPhone, iPad, and Mac. Import a book on your Mac and it appears on your phone within minutes.
• Free book discovery. Browse and download from Standard Ebooks, Internet Archive, and more directly in the app. Over 1.5 million public domain titles, no account needed.
• Accessibility fonts. Ten font options including OpenDyslexic and Atkinson Hyperlegible, alongside traditional choices like Literata, Merriweather, and Noto Serif. Adjust line spacing, margins, paragraph spacing, and text weight.
• Two reading modes. Paginated (traditional page turns) and continuous scroll. Pick what feels right for the book you are reading.
• Comic book reader. CBZ, CBR, and CB7 files display with proper page-by-page rendering, including right-to-left reading for manga.
• Calibre wireless sync. Connect to your Calibre library over WiFi from your Mac, no cable or manual export needed.
• Privacy-first. No account, no tracking, no data collection. Your library stays in iCloud and on your device.
• OPDS support. Browse any OPDS catalog, connect to content servers, or share your macOS library with other readers on the local network.

Limitations: No audiobook support. No built-in bookstore for purchasing commercial ebooks. No Adobe DRM support (DRM-free books only).

BookShelves is free for up to 10 books. The Pro upgrade removes the limit and unlocks iCloud sync, highlight export to Markdown/JSON/CSV, and the OPDS server.

For a step-by-step walkthrough, see our guide to reading EPUBs on iPhone and iPad.

Your ebook library on every Apple device

BookShelves reads EPUB, PDF, MOBI, comics, and more. iCloud sync keeps everything together.

Apple Books - Best for Store Purchases

Apple Books comes pre-installed on every iPhone and iPad. For books bought from the Apple Book Store, it works well: purchases sync, the reading interface is polished, and everything ties into your Apple ID.

Strengths:

• Zero setup, already on your device
• Clean, polished reading interface
• Apple Book Store integration
• Syncs with Mac, iPhone, and iPad

Limitations:

• Unreliable sideloaded book import (files sometimes fail silently, lose cover art, or duplicate)
• No MOBI, AZW, FB2, or comic book support
• No annotation export
• No OPDS support for connecting to free book catalogs
• Basic library management with no custom shelves or tags
• No metadata editing for sideloaded books

Apple Books is a storefront with a reader attached. If you buy everything from Apple, it works. If you bring your own files, you will run into constant friction. See our Apple Books alternative guide for a deeper comparison.

Kindle - Best for the Amazon Ecosystem

Amazon’s Kindle app gives you access to the world’s largest ebook store. If your library is primarily Amazon purchases, this is the obvious choice.

Strengths:

• Massive ebook store with competitive pricing
• Whispersync keeps your position across all devices
• X-Ray, Word Wise, and vocabulary builder for supported books
• Send to Kindle now accepts EPUB files

Limitations:

• Designed for Amazon purchases, not personal libraries
• DRM-locked ecosystem: books you buy can only be read in Kindle apps
• No library management for sideloaded files
• No comic book support
• The iOS app can no longer sell books directly (Apple’s in-app purchase rules), so you have to buy on Amazon’s website and then sync

Kindle’s reading experience is genuinely good, and the store selection is unmatched. But your library is Amazon’s library. You are renting access, not owning files. For readers who care about that distinction, DRM-free stores are worth exploring.

Kobo Books - Best for Kobo Hardware

Kobo Books is Rakuten’s reading app. If you own a Kobo e-reader, this is the companion app that keeps everything in sync.

Strengths:

• Solid reading experience with good typography controls
• Kobo store integration with frequent sales
• Syncs with Kobo e-readers (Libra, Clara, Sage)
• Supports EPUB and PDF, including sideloaded EPUBs via Kobo’s web interface

Limitations:

• Primarily designed for Kobo store purchases
• No MOBI, FB2, or comic book support
• Limited sideloading workflow on iOS
• No annotation export to external formats
• No free book discovery built in

Kobo strikes a good balance between store and reader. Their e-readers are arguably the best hardware for EPUB, and the iOS app is a decent companion. But as a standalone iOS reader for personal libraries, it falls short on format breadth and import flexibility.

KyBook 3 - Best for OPDS Power Users

KyBook 3 is a paid reader with strong OPDS catalog support and a deep feature set that appeals to technical users.

Strengths:

• Excellent OPDS catalog browser
• Supports EPUB, PDF, MOBI, FB2, DJVU
• Highly customizable reading interface
• Text-to-speech
• Tags and collections for organization

Limitations:

• $3.99 upfront with no free tier
• Less actively maintained (infrequent updates)
• No comic book support (CBZ, CBR, CB7)
• Smaller community and fewer online resources

KyBook 3 is a capable reader that has been around for years. If you rely heavily on OPDS catalogs and want granular control over your reading settings, it is worth the price. But the slower update cadence is a concern on a platform where iOS changes can break third-party apps.

Yomu - Clean and Minimal

Yomu is an indie reader that has been on the App Store since 2013. It takes a minimalist approach: clean interface, solid EPUB rendering, and iCloud sync across Apple devices.

Strengths:

• Clean, distraction-free reading interface
• iCloud sync for books, positions, and annotations
• Supports EPUB, PDF, MOBI, AZW, CBZ, CBR
• Available on Mac, iPhone, and iPad
• Readwise integration for highlights

Limitations:

• No automatic metadata lookup (you enter book details manually)
• No built-in free book catalog
• No OPDS server
• Limited highlight export options (Shortcuts and Readwise only, no Markdown/JSON/CSV)

Yomu is a solid choice if you value simplicity and already have a well-organized library. It does the basics well. Where it falls short is the ecosystem around reading: no free book discovery, no metadata automation, and limited export options.

How to Choose

Pick BookShelves if you manage a personal ebook library across multiple formats and want iCloud sync between your iPhone, iPad, and Mac. Especially strong if you read free classics, need accessibility fonts, or have a Calibre library.

Pick Apple Books if you exclusively buy from the Apple Book Store and never sideload files.

Pick Kindle if your library is primarily Amazon purchases and you are comfortable with DRM.

Pick Kobo if you own Kobo e-reader hardware and want everything in sync.

Pick KyBook 3 if OPDS catalog browsing is central to how you find books.

Pick Yomu if you want a minimal, focused reader and do not need free book discovery or metadata automation.

For most people building a personal ebook library on iPhone or iPad, the gap between Apple Books and a good third-party reader is significant. Apple Books is designed to sell you books. The alternatives listed here are designed to help you read the books you already have.

Related Guides

• How to Read EPUB Files on iPhone and iPad - step-by-step guide for getting EPUBs onto your iOS device
• How to Read EPUB on Mac - the companion guide for macOS
• Best Apple Books Alternatives - a deeper look at switching away from Apple Books
• Best eBook Readers for Mac - the macOS version of this comparison
• Where to Buy DRM-Free Ebooks - stores that sell ebooks you actually own