Admire the effort, but not functional yet
Its free, and it looks like it will look good someday, but its just not sufficiently functional to read a book on yet. Other folks have mentioned the absence of bookmarks and the desirability of setting and layout saves for individual books, and those would be good features to have. I was looking for a minimalist ebook reader and between the current design and those two options, Kitabu would fit the bill… if only it could read the EPUB format reliably!
Instead, out of about thirty EPUBs that I have (all of which render properly and are readable in Calibre), only about two are readable in Kitabu. With the rest, I can read the first few pages, but after that, the software starts rendering the text slightly off page, and then eventually fails to page properly at all, skipping the remainder of the text in a chapter and instead only going to subsequent chapter title pages. These are non-DRM files.
Hopefully the developer will keep at it, but being able to actually see the text of the book is pretty much job one, and Kitabu doesnt do it reliably enough yet.
Scuzzmonkey about Kitabu