9to5Mac checked out the Prologue for iPhone
A quote from the article:
When I moved in 2013, I decided I was done with physical media for TV shows and movies and ripping all of my DVDs into digital format. I set up my first very Plex server running on an old MacBook Pro I had, and it worked well for several years. After that, I used an Nvidia Shield for several years and recently moved to an Intel NUC with a 14 TB external drive to house all of my media. I then have my setup rounded out with a Backblaze subscription to keep everything backed up. Plex is an essential part of my media life for TV and Movies. Earlier this year, I added a new type of media to my server: Plex audiobooks with the Prologue app.Prologue for iPhone Review