Pageless

Pageless is the native Android client for Pageless, a self-hosted audiobook
server. It is offline-first: browse your library, download books for offline
listening, play without a connection, and sync your progress back to your own
server over its token-authenticated JSON API.

You must run your own Pageless server; the app connects to a server URL that you
configure on the login screen. No account or data is sent to any third party.

Server source and setup instructions:
https://github.com/dcaixinha/pageless

Features:

* Browse your library, series, collections, and playlists.
* Open book details with metadata, chapters, bookmarks, and listening progress.
* Download books (audio and covers) for fully offline playback.
* Media3-powered background playback with notification and lock-screen controls,
a mini-player, and a full Now Playing screen.
* Playback progress, bookmarks, and listening history sync back to your server,
merged last-write-wins so multiple devices stay in agreement.
* Light, dark, and system themes.

Pageless is free software, released under the GNU General Public License v3.0 or
later.