If you have something critical to monitor, my advice is to stay away from Uptime Robot. I've used them for a couple years along side my Pingdom checks. They oft

If you have something critical to monitor, my advice is to stay away from Uptime Robot. I've used them for a couple years along side my Pingdom checks. They often don't deliver notifications. My last notification is ".... resource is down. We'll notify you when it's back up." That was 10 days ago and it was down for a few minutes. I was never notified of it coming back up. This is just typical. It's also common that I never get a notification of a down resource, too.