Best Alternatives to Readr in 2025
Readr is a free, open-source ebook reader for iPhone, iPad, and Mac that stands out with its AI-powered question-answering, margin notes grounded in the book, spoiler-free recaps, and unlimited natural read-aloud. However, if you're looking for different platforms, more customization, or a broader ecosystem, here are the best alternatives to Readr, each with its own strengths.
Apple Books
Best for Apple users who want a seamless, native experience with a polished interface, iCloud syncing across devices, and a vast bookstore. While it lacks Readr's AI Q&A, it offers excellent typography, audiobook integration, and a clean reading environment for EPUB and PDFs.
KOReader
Ideal for power users and e-ink device owners (like Kindle, Kobo, PocketBook). It's open-source, highly customizable, supports a wide range of formats (EPUB, PDF, MOBI, DJVU), and includes features like dictionary lookup, annotations, and advanced typesetting. However, it has a steeper learning curve and no AI assistance.
Calibre
The ultimate ebook manager and converter for desktop (Windows, Mac, Linux). While not a dedicated reader for mobile, it excels at organizing, converting, and editing your library. You can read books in its built-in viewer, but its strength is library management, making it a great companion to any reader.
KyBook 3
A feature-rich reader for iOS and macOS that supports EPUB, PDF, CBZ, and audiobooks. It offers cloud storage integration, OPDS catalogs, and extensive customization (themes, fonts, margins). It's a strong alternative if you want a powerful, offline-first reader without AI features.
Marvin 3
A beloved iOS reader focused on beautiful typography and a distraction-free experience. It supports EPUB and PDF, has robust annotation tools, and integrates with cloud services. While it doesn't have AI Q&A, its reading statistics and customization make it a favorite among bookworms.
Librera Reader
A free, open-source Android reader that supports a huge range of formats (EPUB, PDF, MOBI, DJVU, etc.). It offers a customizable interface, text-to-speech, and annotation tools. It's a great cross-platform alternative if you're not tied to Apple's ecosystem and want a lightweight, ad-free reader.
FBReader
A cross-platform reader (Android, iOS, Windows, Mac, Linux) with a simple, consistent interface. It supports EPUB, MOBI, FB2, and more, plus syncs your reading progress via its own cloud or third-party services. It's a reliable choice for those who want a straightforward reader with minimal distractions.
While Readr is unique for its AI-driven Q&A and read-aloud features, the best alternative depends on your priorities. For Apple-native polish, choose Apple Books. For deep customization and e-ink support, KOReader is unbeatable. Calibre is essential for library management, while KyBook 3, Marvin 3, Librera, and FBReader offer varied strengths in design, platform support, and format compatibility. If you need AI assistance, you may still want to keep Readr for its core feature, but these alternatives cover other reading needs.