Chaptarr is free software, licensed under the GNU General Public License, version 3. See the LICENSE file for the full license text. If you found and ran Chaptarr from Docker Hub and would like a copy of the source code as required by this license, please reach out on Discord and it will be sent to you.
- Copyright © 2026 Chaptarr contributors.
- Portions copyright © 2010–2026 the Servarr team and contributors.
Upstream copyright notices are preserved throughout the source code in accordance with the GPL.
Chaptarr is a fork of Readarr, an eBook and audiobook manager that is part of the Servarr project family. Readarr is built on the shared codebase behind Sonarr, Radarr, Lidarr, and Prowlarr.
Chaptarr would not exist without the years of work the Servarr team and their contributors put into those projects. We are grateful for it.
Chaptarr is an independent, community-run project. It is not affiliated with, endorsed by, or supported by the Servarr team or the Readarr, Sonarr, Radarr, Lidarr, or Prowlarr projects. Please direct Chaptarr questions and support requests to the Chaptarr project — not to them.
Chaptarr is developed and maintained with the assistance of AI tools.
Chaptarr's optional audiobook conversion shells out to external tools that are bundled in the official Chaptarr Docker image — they are not part of this source tree. Each remains under its own license:
| Component | License | Source |
|---|---|---|
| m4b-tool (by sandreas) | MIT | https://github.com/sandreas/m4b-tool |
| FFmpeg | LGPL-2.1-or-later (portions GPL, depending on build) | https://ffmpeg.org/ |
| mp4v2 | MPL-1.1 | https://github.com/enzo1982/mp4v2 |
m4b-tool is a PHP application and runs under the PHP runtime provided by the image.
All product names, logos, and brands are the property of their respective owners. Use of them does not imply any affiliation with or endorsement by them.