Can I use Legentibus without internet?

Yes, and no.

You need to be online to download the app and to subscribe. Once subscribed, you can download whatever book you like into your library section in Legentibus. This will make that book available to listen or read along to offline.

Once you go offline, there are things in the app that won’t show, books you can’t see etc. However, all books that you have downloaded will be available for read-alonging or listening in your library. The library can be found by tapping the menu in the top right corner.