This app is incredible, has about 96% of the features I want (including a bunch I didn't even know I wanted!), And makes it very simple to add books. However, the rest of the features (I.e. adding catalogues, tagging, etc) are very cumbersome to access. You can't do it right from the app, it opens a web based window which is difficult to navigate, with tiny text, and pop up windows that move outside your field of view.
One last feature I'd love to see (besides editing catalogues and tagging from within the app) is Library due dates. You can add which library you borrow a book from, and can add dates for when you received it, read it and finished it. But I wish you could add the return date, and possibly even receive a notification. Adding a sliding scale showing the percentage read when returned would be cool too.
Despite these issues, this is one of the best inventory apps I've come across, and therefore I'm still giving it 4 stars. I'd immediately jump it up to 5 if I could edit book details and add/reorder catalogues from within the app.
Thanks for the great app, looking forward to future updats!