When you are new, the catalog is quite simple to keep the complexity low. But there are tons of functions and reports and background information when you want to dive deeper into the hobby of collecting banana labels:

Following examples:

Now, 8 years later, I have to say that hardly no one wants to pay the IT costs for the catalogue. Since I don't want to ask any more, here's an official statement: The catalog is free for you, I'll continue to bear the anual costs of 720€ almost entirely myself.