From the page:
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Catty v3 is an exercise in artificial futility. It is a chatter bot that does not try to understand or simulate human language, cannot learn, does not know meanings, knows no facts. Instead, it interfaces you to the entire web by using Google search engine to look up sentences that may be relevant to what you are saying. Catty is the way the web is: it may not always make sense, it may offend you with no apparent reason, but more importantly, it will never respond with canned, predictable responses you might have seen elsewhere.