CAT is designed to facilitate manual web application penetration testing for more complex, demanding application testing tasks. It removes some of the more repetitive elements of the testing process, allowing the tester to focus on individual applications, thus enabling them to conduct a much more thorough test. Conceptually it is similar to other proxies available both commercially and open source, but CAT provides a richer feature set and greater performance, combined with a more intuitive user interface.

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http://cat.contextis.co.uk/cat/CAT_Beta_4.msi