AudioAnchor VS Gotify

Personally, I use castget to save everything locally and then sync it to my phone and play the files with AudioAnchor, but my methods are rather eccentric.

AudioAnchor (version 2.2.6): Audio player that tracks the listening process of your audio books and podcasts

Audio Anchor is just what you need. It will remember the last position of every audiobook you play. No ads, NoBS, Open source :)

Audio Anchor

AudioAnchor is GPL. Some features include:

Additional features include:

- Set bookmarks

- Adjust playback speed

- Export and import listening progress as SQL database

- Sleep timer

- Lock screen media controls (for Android 5.0 Lollipop and higher)

Available on F-Droid. I can't vouch for it but seems to tick some of the boxes.

Link: https://github.com/flackbash/AudioAnchor

I use apprise with Gotify

You can self-host a notification service using https://gotify.net/ for example, but you may need to ask the user to disable battery usage restrictions if you don't want the OS to kill the background process.

If you do not need the state tracking, but instead need something that can deliver push notifications to you, check out ntfy and gotify

Gotify (version 2.5.1): A client for receiving push notifications

I've found Gotify to work well for that

Just FYI - there's also shoutrrr and gotify with similar functionality. I've tried them, they're very good, but not fitting my (very humble) needs.