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Their alerting is some of the most powerful I have seen, and the status pages are clean and simple to use.

I have OnlineOrNot monitoring all of my infrastructure and have automated outage alerts configured so that both my users and I are in the loop and I can resolve issues rapidly.

OnlineOrNot constantly asks how it can improve, which speaks volumes to how much they care about the user's experience and how much they care about said users.

Brett (Alex) Bowles, Founder of Casterlabs