Colnect describes itself as a comprehensive collectibles catalog. In addition to stamps, philatelic products, and postcards, it also includes drink labels, beer coasters, bottle caps, coins, banknotes, comics, and more.
Colnect provides search and browse access for each of its categories. Browsing options are specific to the type of collectible. Colnect indicates that it lists over one million stamps, over 143,000 philatelic products, and over 299,000 postcards.
Stampworld bills itself as the largest online stamp catalogue with over 700,000 color pictures, and over 750,000 stamp listings. Additionally, Stampworld provides a directory of stamp organizations, postal services, dealers, auctions, and events.