You can find several tools on the internet to monitor your website. It’s good to know when and how often your website is offline. For me, I wanted to have a notification from a tool so I could check it before a client calls me to tell that his website is offline.
I’ve tried a couple tools and liked Pingdom the most, but their price plans changed some weeks ago. I’m now limited to one website per account. So I started my search for a new uptime monitoring tool. UptimeRobot fits exactly what I need.
I can add up to 50 monitors that check each 5 minutes for downtimes, totally free. As notification I’ve setup an e-mail but it has integrations with several tools like Slack (which we use at our company for sending downtown notifications).