Privacy Policy

App: Liseur (com.chmouel.liseur) Developer: Chmouel Boudjnah Last updated: 19 August 2026

Liseur is an open-source ebook reader. It has no account, no advertising, no analytics and no trackers, and it collects nothing about you. Its source code is public at https://github.com/chmouel/liseur, so every claim on this page can be checked rather than taken on trust.

What Liseur collects

Nothing. There is no server run by the developer, no crash reporting, no usage measurement, no advertising identifier, and no account to sign up for. No data leaves your device except to the servers described below, which are ones you choose and enter yourself.

What Liseur stores on your device

All of this stays in the app’s own private storage:

Your library: the books you added, their metadata and their covers.
Where you are in each book, along with your reading history and the time you have spent reading.
Your highlights, notes and bookmarks.
Your reading preferences: theme, font, size, spacing, margins.
If you connect a book server, its address and the credentials or token it issued. Those are encrypted with a key held in the Android Keystore, which cannot be exported from the device.

Uninstalling the app removes all of it.

Liseur reads EPUB files from a folder you pick through Android’s own document picker. It only ever sees the folder you granted, and it does not copy your books anywhere.

Network access

Liseur talks to exactly two kinds of address, both chosen by you.

Your book server

If you connect a book server, Liseur talks to the calibre-web, Komga or liseur-sync server whose address you entered. It sends the credentials that server asked for, downloads the books and covers you request, and exchanges your reading position so the same book resumes in the right place on another device. You operate that server, or someone you trust does. This policy does not cover what the server does with the data it receives.

A dictionary site, if you enable it

Looking a word up online is off by default. When you switch it on, Liseur sends the single selected word to the dictionary site configured in Settings, by default the public Wiktionary API, over HTTPS. No identifier, book title or account accompanies it. You may point this at any Wiktionary edition or mirror, or leave the feature off and hand words to an offline dictionary app installed on your device instead. When you pick or type a dictionary site in Settings, Liseur checks it once with a fixed word (“book”). A dead address fails then, and opening the screen makes no request.

Liseur never contacts any other host. It requests the INTERNET and ACCESS_NETWORK_STATE permissions for the two purposes above and for nothing else.

Android backup

Liseur takes part in Android’s standard backup, so your library, reading positions, highlights, notes and settings can follow you to a new device. That backup is handled by Android and stored in your own Google account, under Google’s terms, not the developer’s. Liseur has no access to it. Downloaded book files and generated covers are deliberately excluded. Server credentials are included but arrive unreadable on a new device, because the key that encrypts them never leaves the old one. Liseur notices this and asks you to sign in again.

You can turn this off in your device’s backup settings.

Children

Liseur is not directed at children and collects no personal information from anyone, of any age.

Nothing is shared or sold, because nothing is collected. The developer receives no data from the app whatsoever.

Changes

Any change to this policy will be published on this page with a new date above, and its history is visible in the repository.

Contact

Questions, or a problem with this policy: open an issue at https://github.com/chmouel/liseur/issues or write to chmouel@chmouel.com.