Suppose, you just bought a large lot of building toy parts. Or you found a few parts between your other toys. And you wonder: "Is this LEGO®?" and if not, "What brand is it then?".
Then you can come here to compare those parts! We have identified 97 brands so far! This page shows brands that are building toys. New brands are added regularly.
Hint: don't throw anything away, before you know what it is. It could easily be a (rare) part of some other toy!