The 12 Best EPUB Readers in 2026 (Every Platform, Free and Paid)

There are dozens of EPUB readers. Most of them do the same thing: open a file, show you text, let you turn pages. The differences are in the details, specifically how they handle highlights, whether they sync across devices, how much you can customize the reading experience, and whether they actually feel good to use.

I tested the most popular options across every platform. Here's what's worth your time.

Best overall

1. Apple Books (iOS, Mac) — Best for iPhone and Mac users

Apple Books ships with every iPhone, iPad, and Mac. It opens EPUB files instantly, syncs your library and reading position through iCloud, and supports highlights, notes, and bookmarks out of the box.

The reading experience is polished. Fonts render well, page animations are smooth, and the night mode is genuinely easy on the eyes. You get a built-in bookstore, audiobook support, and solid search within your library.

The downside is that your highlights are locked inside Apple's ecosystem. There's no export, no API, and no way to access them from a Windows machine or Android phone. If you read exclusively on Apple devices and don't care about getting your highlights out, it's the easiest option.

Good for: People fully in the Apple ecosystem who want zero setup. Misses: No highlight export, no cross-platform support, limited customization.

2. Screvi (Web, iOS, Android) — Best for keeping your highlights

Screvi started as a highlights manager for Kindle and has expanded into a full reading platform. You can upload and read EPUB files directly in the browser or mobile app, highlight passages as you go, and every highlight automatically joins your central library alongside notes from Kindle, Kobo, web articles, and anything else you read.

What sets it apart is spaced repetition for your highlights (so you actually remember what you read), AI-powered search across your entire library, and a feed that resurfaces your best highlights over time. The reading experience is clean and distraction-free, with adjustable fonts, themes, and margins.

If you read across multiple sources and want one place for everything you've highlighted, this is the only reader that treats highlights as first-class content rather than an afterthought.

Good for: Readers who highlight a lot and want to actually retain and revisit what they've marked. Misses: Newer reading platform, still building out some advanced epub rendering features.

3. Moon+ Reader (Android) — Best for Android power users

The most customizable epub reader on Android by a wide margin. Moon+ gives you control over everything: fonts, spacing, margins, colors, page turn animations, gesture mappings, status bar info, auto-scroll speed. If you can think of a reading preference, Moon+ probably has a setting for it.

It supports EPUB, PDF, MOBI, CBR, and about a dozen other formats. The Pro version ($7 one-time) adds cloud sync, statistics, and removes ads. The free version is fully functional for reading.

Reddit consistently recommends Moon+ as the best Android ebook reader, and for good reason. The reading engine is fast, the typography is good, and the feature depth is unmatched on the platform.

Good for: Android users who want full control over their reading setup. Misses: Android only, UI looks dated, learning curve for all the settings.

4. Readwise Reader (Web, iOS, Android) — Best for read-it-later + books

Readwise started as a highlights tool and built Reader as a companion app for reading articles, PDFs, EPUBs, and email newsletters in one place. The reading experience is solid, with good typography and a clean interface.

The tight integration with Readwise's highlights system is the main draw. Everything you highlight feeds into daily review emails, and syncs to Notion, Obsidian, or Roam if you use those. At $8.99/month, it's the most expensive option on this list, but the workflow integration is strong if you're already paying for Readwise.

Good for: Heavy readers who want a single app for articles, books, and highlights with PKM integrations. Misses: Expensive, epub reading is secondary to the article reader.

Best free options

5. Calibre (Windows, Mac, Linux) — Best for managing large libraries

Calibre isn't really an epub reader, it's an ebook library manager that happens to include one. If you have hundreds of ebooks in various formats, Calibre is how you organize, convert, and manage them. It converts between EPUB, MOBI, AZW3, PDF, and practically every ebook format that exists.

The built-in reader is functional but basic. The real value is the library management: bulk metadata editing, smart columns, format conversion, and the Calibre Content Server that lets you access your library from any browser on your network.

Good for: People with large ebook collections who need organization and format conversion. Misses: The UI is from 2008 and it shows. Desktop only.

6. ReadEra (Android) — Best free Android reader

ReadEra is ad-free, account-free, and does exactly what you expect. Open EPUB, PDF, MOBI, and other formats, read them with a clean interface, and that's it. No cloud features, no social features, no subscriptions.

The reading experience is good. Font rendering is clean, the theme options cover light/dark/sepia, and the app is fast. It tracks your reading statistics (time spent, pages per session) which is a nice touch.

Good for: Android users who want a simple, free, ad-free reader with no strings attached. Misses: No sync, no highlight export, Android only.

7. Thorium Reader (Windows, Mac, Linux) — Best free desktop reader

Built by EDRLab, a European nonprofit focused on open reading technology. Thorium is the most standards-compliant EPUB reader on desktop. It handles EPUB 3 features (audio, video, fixed layout) better than almost anything else.

The interface is modern and clean, especially compared to Calibre. It supports OPDS catalogs (so you can browse and download from online libraries directly), and handles DRM-protected EPUBs through Adobe DRM and LCP.

Good for: Desktop readers who want a modern, standards-compliant reader with good EPUB 3 support. Misses: No mobile apps, no highlight sync, smaller community.

8. FBReader (Android, iOS, Web, Desktop) — Best cross-platform free option

FBReader has been around since 2005 and has over 30 million installs. It runs on Android, iOS, Windows, Mac, and Linux, with a cloud sync option (FBReader Premium) that keeps your library, bookmarks, and reading position in sync across devices.

The free version covers the basics well. The interface isn't flashy but it's fast and reliable. OPDS catalog support means you can browse and download from online libraries without leaving the app.

Good for: Readers who want one app across multiple platforms without paying a subscription. Misses: The free version has limited features, the design feels utilitarian.

Best for specific platforms

9. PocketBook Reader (iOS, Android) — Best multi-format mobile reader

PocketBook supports 25+ file formats, which is more than any other mobile reader. EPUB, PDF, DJVU, CBR, FB2, MOBI, DOC — if it's a document format, PocketBook probably reads it.

The app is free, ad-free, and includes text-to-speech, cloud storage integration (Dropbox, Google Drive), and a built-in bookstore. The reading interface is clean with good customization options.

Good for: Mobile readers who deal with a variety of file formats beyond just EPUB. Misses: No desktop app, highlight management is basic.

10. KyBook 3 (iOS) — Best power-user reader for iPhone

KyBook is the Moon+ Reader equivalent for iOS. Deep customization, support for EPUB/PDF/DJVU/FB2 and more, OPDS catalog browsing, and cloud storage integration. The interface is more capable than Apple Books, with better font controls, custom CSS injection, and regex search.

Costs $4 on the App Store. Worth it if Apple Books feels too limiting.

Good for: iOS users who want more control than Apple Books offers. Misses: iOS only, steeper learning curve.

11. Aquile Reader (Windows, Android) — Best for Windows

Available on the Microsoft Store, Aquile has a modern interface that feels native to Windows. It supports EPUB, PDF, and CBZ, with good reading customization and a clean library view. The Android version keeps your library in sync.

For Windows users specifically, this is the most polished option that isn't Calibre.

Good for: Windows users who want something modern and easy to use. Misses: Smaller feature set than Calibre, no iOS or Mac version.

Best in-browser

12. Flow (Web) — Best browser-based reader

Flow (flowoss.com) is a free, open-source EPUB reader that runs entirely in your browser. Drop an EPUB file onto the page and start reading. No account, no install, no upload to any server — the file stays local.

It supports multiple books open simultaneously, remembers your reading position in localStorage, and has a clean, minimal interface. For quick one-off reading or when you're on a machine where you can't install software, it's the best option.

Good for: Quick reading without installing anything. Misses: No sync, no highlights export, reading position is tied to your browser.

How to choose

If you read mainly on iPhone/Mac and don't need highlight export: Apple Books.

If you highlight a lot and want to actually remember and revisit what you've read across all your books and articles: Screvi.

If you're on Android and want maximum customization: Moon+ Reader. If you want simplicity: ReadEra.

If you manage hundreds of ebooks and need format conversion: Calibre.

If you want one app everywhere for free: FBReader.

If you're already paying for Readwise and want everything in one subscription: Readwise Reader.

The biggest mistake most readers make isn't picking the wrong app. It's highlighting hundreds of passages across three different readers and never seeing any of them again. Whatever reader you pick, make sure your highlights end up somewhere you'll actually look at them.