General AI video tools hand you a model picker, a prompt box, an aspect-ratio menu and a resolution ladder. That flexibility is useful for filmmaking and useless for a meme: the joke is the same every time, so the tool should be too. CatClap reduces the input to the two things that actually change the result - the person and the cat.
Under the hood it is a reference-to-video render against a fixed template. Your two photos supply the identities (face, fur pattern, proportions) and the template supplies the motion and the framing. Ten seconds is long enough for the applause to land and short enough to post without trimming.
Renders run as asynchronous tasks. After you press generate, the page polls for status instead of holding a request open, so you can leave the tab. When the provider reports success the clip appears in your creations; tasks that produce nothing return their credits automatically.