Dividing Line Books
Lacks even rudimentary customization. For instance, you can't even turn off the lightbox from displaying title and description at the bottom of every photo. All but the main photo also have a strip of text that says "Load image into Gallery viewer"... & I wasn't able to find any way to remove this.
I might pay a 2.99 flat fee for this app & try to tweak it on my own. But a recurring monthly payment? Forget it.