Open Source Kotlin eBook Readers

legado is a feature-rich open-source ebook reader for Android, focused on flexibility, extensibility, and customization. It supports local books, online book sources, and plugins for a personalized reading experience. With powerful configuration options, including layout settings, font control, and background customization, it’s ideal for avid readers looking for complete control over how they read digital content.

TachiyomiJ2K is a free and open source manga reader for Android 6.0 and above. Based on the original Tachiyomi.

Myne is a FOSS Android application to download ebooks from Project Gutenberg, it uses GutenDex API to fetch metadata of ebooks in the backend.

Futon is an Android reader for manga, webtoons, light novels, and other digital publications. It provides access to more than 1,200 manga sources and several online novel catalogs. Users can search by title, genre, and other filters while organizing favorites into custom categories. Dedicated manga and novel reading modes allow seamless switching between visual and text-based content. The manga reader supports standard pages and vertical webtoon scrolling, while the novel reader offers customizable typography and themes. Chapters and books can be downloaded for offline reading. Local CBZ, EPUB, and PDF files are also supported. Reading history, bookmarks, update notifications, and tracking integrations help manage ongoing series. Additional controls include biometric locking, incognito mode, and account synchronization.

LightNovelReader is a free, open-source Android application designed for reading light novels from multiple online sources. Built with Kotlin and Jetpack Compose, it provides a lightweight interface and smooth reading experience. Users can discover novels through recommendations, rankings, categories, and keyword searches. Its multiple-source system allows readers to switch content providers and access manga from compatible sources. The application supports caching book content for offline reading. Users can organize favorites into named bookshelves and receive notifications about novel updates. Complete books can be exported as EPUB files for reading in other applications. LightNovelReader also supports custom source plugins and personalized reading backgrounds.

Reader is an open-source Android application designed for online and offline reading of web novels, manga, and comics. It supports importing sources through custom rules, enabling access to content from various sites without centralized control. Reader provides a clean, customizable reading interface and supports synchronization, local storage, and different viewing modes for an enhanced reading experience.

Aftergleam is a privacy-focused Android application for discovering, ranking, and reading newly published academic research papers. It gathers publications from repositories covering physics, computer science, medicine, social sciences, law, chemistry, and other disciplines. A personalized daily digest highlights relevant papers and explains why each was selected. Its recommendation model learns from reading preferences and reactions directly on the device. Custom keywords prioritize papers mentioning specific research topics and provide notifications for new matches. Users can explore unfamiliar subjects or browse popular publications. An integrated PDF reader supports searching, copying text, and offline access. A specialized arXiv reader presents responsive text, figures, tables, and equations. Aftergleam also supports Zotero library imports and reading history exports without requiring an account.