BookFusion vs Thorium Reader

BookFusion is a digital library and reading service for organizing, reading, sharing and syncing eBooks across web, iOS and Android. Its reader supports PDF, MOBI and EPUB, and carries bookmarks, comments, highlights and reading progress between devices. Downloaded books are available offline. Readers can arrange titles by author, genre and custom tags, with rule-based Smart Shelves and Smart Queries also described. An official Calibre plugin syncs books and metadata using an API key and requires Calibre 5.0 or later; a KOReader plugin supports browsing the library, downloading books and syncing position and highlights. The store offers over 70,000 free eBooks as well as titles for purchase. Personal uploads must be DRM-free, and storage and maximum file size depend on plan. The Free plan allows 10 books and files up to 15 MB. Paid individual plans start at $1.99 per month billed yearly. Social reading is beta; discovery is coming soon, while lending and borrowing are upcoming.

Thorium Reader is a free reader and library for ebooks, audiobooks, comics, manga, and documents. It runs on Windows, macOS, Linux, iOS, and iPadOS, with minimum versions listed by the maker. Supported material includes EPUB 2/3, fixed-layout EPUB, PDF, DAISY, Web Publications, audiobook formats such as MP3 and FLAC, and comics in CBZ, EPUB, or PDF. The app opens DRM-free publications and Readium LCP-protected titles from compatible retailers or libraries. Downloaded items work offline, although LCP files need an online connection at least once. Readers can change text size, themes, spacing, and fonts, and use keyboard navigation with custom shortcuts. Accessibility support includes JAWS, NVDA, Narrator, and VoiceOver; the iOS statement notes VoiceOver limitations for EPUB and PDF reading. Desktop users can browse OPDS catalogs when providers allow it. EDRLab develops Thorium Reader, and support is offered through a Help Desk and Discord.