Liseur

Read EPUBs your way: follow the text as it reads aloud, translate a page as you go, or ask about characters and events. Liseur brings books from your phone, OPDS catalogs, calibre-web, Komga, BookOrbit and liseur-sync into one library.

Read aloud

Listen to any EPUB with sentence highlighting and automatic page turns. Android voices can read offline when a compatible offline voice is installed. Choose voices by language, adjust the speed, keep listening with the screen off, or set a sleep timer. Connect an OpenAI-compatible speech server, including one on your own network. The Google Play build also offers Gemini voices with your own API key.

Translation

Translate a selection or read a book page by page in another language. Liseur saves translated sentences on your phone, so they are ready when you return to a page. Use Android's on-device translator, an OpenAI-compatible service on your network or hosted online, or, in the Google Play build, Gemini or Google ML Kit. Read translated pages aloud in the target language and look up words without leaving the page.

Reading companion and Codex

Ask the reading companion about characters and events. Character profiles use passages before the selected text, including earlier chapters and earlier passages in the current chapter; source excerpts show where details come from. Turn on background chapter recaps for each book. Use an OpenAI-compatible service; the Google Play build also supports Gemini with your own API key.

Codex builds a searchable, on-device index of people, places and groups, and shows which names appear together in earlier chapters. It needs no AI service or API key.

Your reader

Choose paginated pages or continuous scroll, adjust type, margins and brightness, and use light, sepia, dark or black themes. Add highlights, notes and bookmarks, search the full text, and open footnotes in a popup. Import your own fonts or use the bundled and publisher fonts. E-ink mode turns off animations and supports refresh controls on Onyx devices.

Your library and sync

Browse local folders and SD cards, group books into series, or find free books in the built-in Project Gutenberg catalog. Home-screen widgets show your current book or a shelf of covers. Back up settings, fonts, reading positions and annotations in a ZIP file.

Sync reading positions with calibre-web, Komga, BookOrbit or liseur-sync. Connect any OPDS catalog to a KOReader sync server. With liseur-sync, back up settings per device and see reading statistics across devices.

Privacy

No ads. No account is required to read books stored on your device. Android's system translator and Codex process book text on your phone. Google ML Kit also translates on-device, and sends usage diagnostics to Google. When you choose an online service for translation, the reading companion or speech, Liseur sends text to that provider. Optional dictionary lookups contact Wiktionary; Project Gutenberg is contacted when you browse its catalog.

MIT licensed. Source code and issue tracker: https://github.com/chmouel/liseur

Recent changes:
The on-device Codex lists people and places, shows their passages and relationships, and opens passages they share. The Reading companion provides spoiler-free profiles and chapter recaps. You can translate pages with earlier chapter context, look up translated words, and read translated pages aloud. Translation and read-aloud can use local servers. The bookshelf widget is back, and backups can include password-protected accounts and services.