I use https://aremysitesup.com/ and I've found it really helpful as it one of the few inexpensive services I've found that will CALL me if things are down. SMS is nice, but I use the do-not-disturb feature on my phone in the evenings, and at least on iOS, the only way to punch through that is with a call from a number on my favorites list. This meets that need very well and I've found the service to be quite spot on alerting me (both when I had one instance of things hitting the fan, but also during scheduled maintenance). I'd highly recommend.
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I use https://aremysitesup.com/ and I've found it really helpful as it one of the few inexpensive services I've found that will CALL me if things are down. SMS is nice, but I use the do-not-disturb feature on my phone in the evenings, and at least on iOS, the only way to punch through that is with a call from a number on my favorites list. This meets that need very well and I've found the service to be quite spot on alerting me (both when I had one instance of things hitting the fan, but also during scheduled maintenance). I'd highly recommend.