# Alternatives to KOReader Open source reader for e-ink devices. KOReader ranks #3 of 8 in Ebook readers, with an Alt Score of 80. It is licensed under AGPL-3.0, free from Free and available on Android and Linux. 7 of 9 checklist rows are verified against a public source. Source: https://altcatalog.com/alternatives/koreader/ Category: Ebook readers ## Where KOReader stands out - **Formats (EPUB, PDF, MOBI, CBZ)** — 4 of 8 apps with a verified answer have this ## Overview - **Who it's for**: Owners of e-ink e-readers (Kindle, Kobo, PocketBook, Cervantes, reMarkable) and Android or Linux users who want one reader for many document formats instead of being locked into a device's stock software. - **What you get**: KOReader opens EPUB, PDF, DjVu, CBT, CBZ, FB2, MOBI, DOC, RTF, HTML, CHM, TXT and other formats in a single app. It includes built-in dictionary and Wikipedia lookup, PDF reflow via K2pdfopt for reading scanned documents on small screens, adjustable typesetting (margins, line spacing, fonts, hyphenation), reading statistics, and an e-ink-optimized interface with gesture controls and no animations. It also supports OPDS catalogs, calibre wireless library access, and syncing reading progress across devices. - **How it works**: You install KOReader on your e-reader, Android device, or Linux machine, then open files directly or browse/download them via calibre or an OPDS catalog. Reading is driven by tap zones and gestures for page turns, menus, and settings, with the software free and open source under GitHub. ## Profile - **License**: AGPL-3.0 (verified 2026-07-10) - **Pricing model**: Free (verified 2026-07-10) - **Starts at**: Free (verified 2026-07-10) - **Platforms**: Android, Linux - **Status**: active (verified 2026-07-10) ## Ranked alternatives | # | App | Alt Score | Licence | Platforms | |---|-----|-----------|---------|-----------| | 1 | [Calibre](https://altcatalog.com/alternatives/calibre.md) | 90 | GPL-3.0 | Windows, macOS, Linux, iOS | | 2 | [Moon+ Reader](https://altcatalog.com/alternatives/moon-reader.md) | 90 | Proprietary | Android | | 3 | [Librera](https://altcatalog.com/alternatives/librera.md) | 80 | GPL-3.0 | Android, macOS | | 4 | [Apple Books](https://altcatalog.com/alternatives/apple-books.md) | 75 | ? | iOS, macOS | | 5 | [Google Play Books](https://altcatalog.com/alternatives/google-play-books.md) | 75 | Proprietary | Android, iOS, Web | | 6 | [Kindle](https://altcatalog.com/alternatives/kindle.md) | 75 | Proprietary | Windows, macOS, iOS, Android | | 7 | [ReadEra](https://altcatalog.com/alternatives/readera.md) | 35 | Proprietary | Android | Alt Score = Verified coverage (90%) + Visibility (10%). See https://altcatalog.com/how-alt-score-works/ ## Feature comparison Legend: Yes / No / Partial / ? (not verified). | Ebook readers checklist | KOReader | Calibre | Moon+ Reader | Librera | Apple Books | Google Play Books | |---|---|---|---|---|---|---| | Pricing model | Free | Free | Freemium | Freemium | Free | Freemium | | Starts at | Free | Free | ? | ? | Free | Free | | License | AGPL-3.0 | GPL-3.0 | Proprietary | GPL-3.0 | ? | Proprietary | | Platforms | Android, Linux | Windows, macOS, Linux, iOS, Android | Android | Android, macOS | iOS, macOS | Android, iOS, Web | | Formats (EPUB, PDF, MOBI, CBZ) | Yes | Yes | Yes | Yes | Partial | Partial | | Sync position across devices | Yes | Yes | Yes | Yes | Yes | Yes | | Annotation & highlights export | Yes | Yes | Yes | ? | ? | Yes | | Dictionaries | Yes | Yes | Yes | Yes | Yes | Yes | | OPDS support | Yes | Yes | Yes | Yes | ? | ? | | Text-to-speech | ? | Yes | Yes | Yes | Yes | Yes | | Page turn customization | Yes | Yes | Yes | Yes | Yes | ? | | Library management | Yes | Yes | Yes | Yes | Yes | Yes | | DRM support | ? | No | No | ? | Yes | Yes | ## Sources Sources for KOReader. Each alternative is sourced on its own page. - **Pricing model**: Free — (verified 2026-07-10) - Quote: “Right now we only support liberapay donations.” - **Platforms**: Android, Linux — (verified 2026-07-10) - Quote: “runs on embedded devices (Cervantes, Kindle, Kobo, PocketBook, reMarkable), Android and Linux computers” - **License**: AGPL-3.0 — (verified 2026-07-10) - Quote: “GNU AFFERO GENERAL PUBLIC LICENSE Version 3, 19 November 2007” - **Starts at**: Free — (verified 2026-07-10) - Quote: “Right now we only support liberapay donations.” - **Status**: active — (verified 2026-07-10) - Quote: “stable builds: released once a month. Release notes are included with the release.” - **Formats (EPUB, PDF, MOBI, CBZ)**: Yes — (verified 2026-07-10) - Quote: “supports fixed page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobi, DOC, RTF, HTML, CHM, TXT)” - **Sync position across devices**: Yes — (verified 2026-07-10) - Note: Progress sync" plugin can synchronize your reading progress through a document across different KOReader devices." - Quote: “The ” - **Annotation & highlights export**: Yes — (verified 2026-07-10) - Quote: “The bundled highlight export plugin is able to export highlights and notes added from both native reader in Kindle and the Koreader itself to Joplin and Readwise as well as local JSON, HTML, Markdown,” - **Dictionaries**: Yes — (verified 2026-07-10) - Quote: “To use the dictionary lookup function, you first need to install one or more dictionaries in the StarDict format.” - **OPDS support**: Yes — (verified 2026-07-10) - Quote: “This plugin adds an OPDS browser to the filemanager, which lets you browse public online OPDS catalogs and download ebooks from these.” - **Page turn customization**: Yes — (verified 2026-07-10) - Quote: “recent versions of KoReader have a built-in feature for inverting page turn buttons (under Settings > Navigation > Physical buttons > Invert page turn buttons)” - **Library management**: Yes — (verified 2026-07-10) - Quote: “Koreader has File manager with different book views: List of files... Book covers view, i.e. mosaic view; Detailed view” --- Ranked by verified data, never by who paid. https://altcatalog.com/trust/