Can I create custom apps?
Yes, WebCatalog lets you create (install) app from any websites. All you need is the URL (web address) of the app.
To create custom app, open WebCatalog, go to Discover page, and click + button next to the search box. Then, you can choose Create Custom Standard App or Create Custom Multisite App, depending on your need.
A dialog will show up and then you just need to fill in the name, URL and icon (optional) of the app and click Install (or Continue) to install it.