Best Apple Books Alternatives for Mac and iPhone in 2026

Apple Books comes pre-installed on every Mac and iPhone. For books you buy from the Book Store, it works fine — purchases sync, the reader is polished, and everything ties into your Apple ID.

But if your reading life extends beyond Apple’s store — free EPUBs from Standard Ebooks, DRM-free purchases from independent bookstores, MOBI files from older collections, or PDFs from work — Apple Books starts showing its limitations. No metadata editing, no MOBI/AZW support, no free book discovery, and basic library management that doesn’t scale.

Here are the best alternatives, depending on what you need.

Quick Comparison

BookShelves

Best for: Mac and iPhone readers who want a native app with format flexibility and free book discovery.

BookShelves is a native macOS and iOS app built specifically for readers who manage their own ebook libraries. Where Apple Books treats sideloaded books as second-class citizens, BookShelves treats them as the main event.

What sets it apart:

• Auto-converts Kindle formats. Drop a MOBI, PRC, AZW, or AZW3 file into BookShelves and it converts to EPUB on import. No Calibre needed, no manual steps.
• Metadata lookup on import. Sideloaded books automatically get correct titles, authors, and cover art — no more “Unknown Author” entries cluttering your library.
• Built-in free book catalog. Browse thousands of public domain classics from Standard Ebooks and Internet Archive, and download them directly into your library.
• iCloud sync. Books, reading position, bookmarks, and highlights sync across your Mac and iPhone.
• Highlight export. Export annotations to Markdown, JSON, or CSV — something Apple Books still doesn’t offer.
• Multi-window on Mac. Open multiple books side-by-side in native macOS windows.
• OPDS client and server. Browse and download from any OPDS catalog, and share your library on your local network with any OPDS-compatible reader.
• EPUB repair. Books with formatting issues are automatically repaired during import. Limitations: No audiobook support. No built-in bookstore for purchasing commercial ebooks. The Pro upgrade ($2.99 one-time) unlocks iCloud sync, highlight export, Read Aloud, OPDS client/server, and more.

BookShelves fills the gap Apple Books leaves open: a reader that’s genuinely designed for people who bring their own books.

Calibre

Best for: power users who manage large libraries and need format conversion.

Calibre has been the standard ebook management tool since 2006. It’s free, open source, and runs on macOS, Windows, and Linux. If you need to convert between formats, bulk-edit metadata, or manage a library of thousands of books with custom tagging, Calibre is unmatched.

Strengths:

• Converts everything. EPUB, MOBI, AZW3, PDF, DOCX, HTML, TXT, LIT, PDB, FB2 — Calibre handles over 20 input formats and converts between most of them.
• Deep metadata management. Custom columns, bulk metadata downloads from multiple sources, regex-based find-and-replace on metadata fields. You can maintain a library with librarian-grade organization.
• Plugin ecosystem. Hundreds of plugins extend Calibre’s functionality — from alternative metadata sources to news fetching to custom output profiles.
• Content server. Run Calibre as a web-based ebook server accessible from any device on your network.
• Completely free. No paid tier, no feature gates, no ads.

Limitations: The interface is Qt-based and looks distinctly non-native on macOS — no dark mode integration, non-standard keyboard shortcuts, and a dense UI that takes time to learn. There’s no iPhone or iPad app, so reading on mobile means exporting books to another reader. No iCloud sync — you manage your own library folder. The built-in reader is functional but basic compared to dedicated reading apps.

Calibre is a workshop, not a reading chair. It’s where you prepare your books — organize, convert, clean up metadata — before sending them to the app where you actually read.

Kindle App

Best for: people who buy most of their books from Amazon.

Amazon’s Kindle app for Mac and iOS gives you access to your Amazon ebook purchases. If your library is mostly Kindle books, this is the simplest way to read them on Apple devices.

Strengths:

• Whispersync. Reading position, bookmarks, and highlights sync across every Kindle app and device automatically.
• X-Ray and Word Wise. Look up characters, terms, and definitions without leaving the page — features that other readers don’t offer.
• Massive store. Amazon’s Kindle Store has the largest selection of commercial ebooks, including many titles not available elsewhere.
• Free with Prime. Prime Reading and Kindle Unlimited give subscribers access to rotating catalogs of books.

Limitations: The Kindle app cannot open EPUB files — the universal ebook standard used by libraries, independent bookstores, and public domain sources. You’d need to email files through “Send to Kindle” for conversion, and formatting often breaks in the process. Books purchased from Amazon use proprietary DRM and can only be read in Kindle apps. The Mac app is an iOS port that lost features in translation — keyboard navigation is limited and the interface feels out of place on macOS. Amazon also tracks detailed reading behavior (pages read, time spent, highlights) for recommendations and advertising.

The Kindle app is excellent if you live in Amazon’s ecosystem. It’s frustrating if you don’t.

Kobo Books

Best for: iPhone and iPad readers who want a store alternative to both Apple and Amazon.

Kobo is Rakuten’s ebook platform — the largest Kindle competitor outside the US. Their iOS app is a polished reader with a built-in store and library sync.

Strengths:

• Clean reading experience. The Kobo iOS app is well-designed with good typography, customizable fonts, and a comfortable reading UI.
• Kobo Plus. Subscription service similar to Kindle Unlimited, with a catalog that includes many titles not on Amazon.
• EPUB support. Unlike Kindle, Kobo natively reads EPUB files — including sideloaded ones.
• Pocket integration. Save web articles to read later in the Kobo app.
• Library ebook support. Borrow ebooks from public libraries through OverDrive/Libby and read them in the Kobo app (on Kobo devices; iOS support varies by region).

Limitations: No macOS app — Kobo is iOS/iPadOS only on Apple platforms (plus their own e-ink hardware). Sideloading EPUBs on iOS requires workarounds. The app prioritizes store-purchased content over personal library management. No metadata editing for sideloaded books.

Kobo is a strong choice if you want a commercial ebook ecosystem that isn’t Amazon and you primarily read on iPhone or iPad.

KyBook 3

Best for: iOS readers who want broad format support and OPDS catalog access.

KyBook 3 is a third-party iOS reader that supports an unusually wide range of formats and connects to OPDS catalogs for discovering free content.

Strengths:

• Format variety. Reads EPUB, PDF, DJVU, FB2, CBR/CBZ (comics), and more — broader than most iOS readers.
• OPDS catalog support. Connect to OPDS servers (including Calibre’s content server or BookShelves’ OPDS server) to browse and download books directly.
• Text-to-speech. Built-in TTS for EPUB and other text formats.
• Customizable. Detailed control over fonts, colors, margins, and reading gestures.

Limitations: iOS only — no Mac version. The interface has a steeper learning curve than Apple Books. Some users report occasional stability issues with large libraries. No iCloud sync for reading progress across devices. One-time purchase of $3.99.

KyBook 3 is a solid choice if you read formats Apple Books doesn’t support and want everything on your iPhone or iPad.

Marvin (Discontinued)

Worth mentioning because it still comes up in recommendations.

Marvin was widely regarded as the best third-party EPUB reader for iOS — deep Calibre integration, powerful annotation tools, and a UI that serious readers loved. The developer stopped updating it, and it’s no longer available on the App Store. If you see it recommended in older forum posts, it’s not an option anymore.

For readers who miss Marvin’s approach — a reader that takes personal library management seriously — BookShelves is the closest modern equivalent on the Apple platform.

How to Choose

Start with what you’re trying to solve:

• “I just want to read my own EPUBs on Mac and iPhone.” BookShelves. It handles import, metadata, sync, and reading in one native app.
• “I have hundreds of books in mixed formats and need to organize them.” Calibre for library management, then a native reader (BookShelves, Apple Books, or KyBook) for actually reading.
• “Most of my books are from Amazon.” Kindle app, plus BookShelves or Apple Books for your non-Amazon books.
• “I want a bookstore that isn’t Apple or Amazon.” Kobo for purchases, plus a separate reader for your personal library.
• “I read comics, DjVu, or FB2 files on my iPhone.” KyBook 3 for format coverage.

The Bottom Line

Apple Books is fine for what it is — a reader that’s optimized for selling you ebooks and syncing your purchases. But “fine” isn’t the same as “best,” especially if you’ve built a personal library from multiple sources.

The good news: you don’t have to pick just one. Most readers use two or three apps — a store app for purchases, a library manager for organization, and a reader for the actual reading. The right combination depends on where your books come from and how you want to manage them.

If you’re looking for a single app that handles personal ebook libraries on Mac and iPhone — import, organize, sync, and read — give BookShelves a try. It’s free, and the built-in catalog of thousands of classics means you’ll have something to read right away.