Name: UptimeRobot
Rating: 4.29 (7 reviews)

An uptime monitoring service that helps users to get acknowledged of the downtimes of their websites/servers and also track the performance of them. It is actively used by 600,000+ users with much more number of monitors being checked regularly.

Monitors are frequently not working, reporting state 30-40 minutes late, or not at all. I have 2 accounts and 1 account may report correctly (e.g. 7 minutes of downtime) while the second doesn't (e.g. won't detect the service is up for 40+ minutes). This happened 5+ times in the past 6 months with no explanation, solution or refund. The latest being last night where different monitors reported widely different uptime, failing to detect a service is back up for 30+ minutes. The uptime charts it generates are wildly inaccurate and it is one of the reasons I picked this product in the first place. Right now, I have a monitor that should be up, but isn't. I contacted their support saying guys, here, a reproducible case: it is clearly broken, please investigate. Their solution? - oh just delete your 3 years of uptime history and it should work because it is "stucked in cache". When I said I do not wish to delete 3 years of uptime history, they said: "what I'm saying is to reset the stats so our checks can be done again" - when I reluctantly deleted the 3 years of history and the monitor showed as online, their response? - see, there is no problem! There are no words.