UptimeRobot

UptimeRobot checks your site every few minutes and emails you if it stops responding. It's better to hear about an outage from a tool than from an angry customer.

What you can do with it

• Monitor your websites around the clock
• Get email or app alerts when they go down
• See a history of downtime

Good to know

The free plan has limits on checks and features. Read the current terms if you're using it for a business.