Audiobook app offline playback (android)

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I think about wether using Deezer or another Audiobook Flat. BookBeat f.e. is more expensive but way more comfortable in using sleeptimer, bookmark and rewinding within the timer period. But I stopped using it, because it controls the time of using it with the limited accounts. You have to go online and I do not like this.

My minimum necessity is real online usage, sleeptimer and bookmark otherwise there is still storytel or nextory.