BookPlayer

Wonderful open-source iOS player for audiobooks in M4B/M4A/MP3/FLAC formats. Allows to control audio playback from the lock screen, Control Center or the companion app on Apple Watch. Books can be imported via AirDrop, iTunes or from AudibookShelf or Jellyfin's own server. You can mark books as read, sort books by drag and drop, edit book details (title, author, cover), change playback speed, enable a sleep timer. Remote events are supported from headset buttons, the lock screen, CarPlay.