Artemis is in the works for a native android client, but, also, kbin is a Progressive Web App on mobile. By that I mean, you can go to the site with chrome, firefox, etc, click the menu, and find "Install" or "Install App". That will give you an icon to put on your home screen, which will just open the site like a standalone app. But using your browser. Which means if you use Firefox mobile, you can still use extensions and user scripts and such if you want to.