I tried
Dotepub to see how it looked and worked. I kept mispronouncing the word using Spanish vowels, until I realized my mistake.)
It works fine, as the public domain attachment shows.
[Copyright is restricted to U.S.]
It took about 30 seconds to correct the AUTHOR and TITLE field, and then to attach an appropriate cover.
I haven't tested it for images.
It looks like it might be an OK replacement for Pocket, although it lacks the convenience of Pocket.