cattaDoc is web/cloud-based: The user needs a browser. The rest is on the backend server.
All the user needs is a web browser and a URL - a web address - for cattaDoc. The user interface is browser-based and no other installation is required in order to run cattaDoc.
The idea is to support all modern web browsers by using standard HTML, including cascading style sheets (CSS) and JavaScript, to display the pages in cattaDoc.
cattaDoc uses cookies for session management, ie. you have to enable cookies in your browser in order to use cattaDoc.
The previous issues - ie. before cattaDoc version 5 - with certain browsers, especially Internet Explorer, has hopefully been eliminated by using Bootstrap.