App to check if websites are online?

elgranchuchu

Distinguished
Nov 13, 2009
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18,580
Hi, i'm a web designer and hosting reseller, what i'm looking for is an app (desktop or web) to check periodically all the websites that i host(bunch of websites) are online. Can you please help me with this?

I need that the app have a list of url's and check it periodically and let me know (mail me) if anyone is offline (error 400-500-300, redirection errors...).