FBReader vs Universal Viewer

FBReader is an ebook reader for Windows, macOS, Linux, Android, and iOS. It opens formats including ePub, fb2, mobi, HTML, RTF, and plain text, as well as ePub books protected with Readium LCP. Its Book Network can synchronize collections, reading positions, bookmarks, and custom shelves across supported devices. Books in the network are stored in the user's Google Drive space, while metadata, covers, and reading positions are stored on FBReader servers.

Online OPDS book catalogues are supported on Android, Windows, macOS, and Linux; iOS support is planned. Android Premium adds PDF and comics support, Google and DeepL translation integration, and automatic reading aloud. The free iOS version is limited to ten books and disables online translators. FBReader offers free plans for desktop, Android, and iOS; Android Premium is $14.99 as a one-time purchase. The company says its current code is closed source.

Universal Viewer is a Windows desktop application for opening a wide range of file formats in one viewer. It handles images, multimedia, Word and Excel files, PDF, RTF, internet formats, text, and formats supported by Total Commander Lister plugins. Image support includes over 40 graphics formats and RAW images from 400+ cameras; its multimedia player supports over 170 formats without external codecs. In the Pro version, Word and Excel files including DOCX and XLSX open without MS Office, and a PDF plugin works without Adobe or Foxit Reader. Pro also adds complex RTF and RAW image support, an image panel with a Convert to feature, and highlighted text search. Text mode handles files of unlimited size, including those over 4 GB, with encodings such as Unicode and UTF-8. Windows Explorer context-menu integration provides a way to open files in the viewer. The free edition’s multimedia support depends on the Windows Media Player engine. Listed system requirements include Windows XP, Vista, 7, 8, 10, and 11. The Pro version has a 15-day trial; paid access starts at $26.