I know there are many website similar to this. But i created it as simple as i could. Check out comparison between websites features in Reports section that lets you compare website up time during interval of 24 hours. Check out app at http://dynofy.com
If you don't want to register , Here is demo url: try.dynofy.com username: demo@dynofy.com password: dark
Suggestion, Criticism , Feedback are appreciated.