FBReader vs Icecream Ebook Reader

Free e-book reader that supports multiple file formats, including ePub, fb2, mobi, HTML, RTF, HTML, plain text, doc, and more. FBReader uses its own page parsing and rendering engine - very lightweight, fast and customizable. It supports embedded images, footnotes, hyperlinks, text search, full-screen reading. It also automatically creates bookmarks so you don't lose track of where you left off after closing a book. It works on iOS, Android, Windows, Mac OS, Linux, and Chrome OS. Books can be synced across devices or stored in Google Drive. For Android and iOS there are both free and paid versions. Free versions have some limitations.

Desktop reader that supports EPUB, MOBI, FB2 and CBR formats (DRM-protected content is not supported) and provides basic functionality for managing your digital library. Allows to read in full-screen mode, night mode, track your reading progress, use bookmarks, search inside text, adjust the font family, font size and line spacing, set the text layout to two or one page. You can add notes, search and sort notes by text or color. Copying text from books and adding notes are only available in the paid version, which also offers text-to-speech (different voices available depending on your system settings) and text translation.