From the developer: "This multi-threaded tool will check for the uptime of up to 4 websites simultaneously, if any of them becomes unavailable, it will send you an email notifying you of the problem, and it will also let you know when access is restored. WebUptime can also send you a warning if a site becomes too slow. A graphical interface easily allows you to keep track of your websites' performance. Your websites are important, be the first to know when a problem arises, don't wait for your customers to complain"