Hi, I am a creator of a replacement for Marvin, as Marvin 3 was one of those apps I used in the past. The app is called justRead, with TestFlight starting in next two weeks. You can read more about it in here:
https://justread.app and especially in here (why is it made the way it is):
https://justread.app/en/blog_post_de...tread_part_two