We will notify you before your customers when your services break. Monitor your services from 20 different locations around the world. Sit back and relax. Focus on your business. Let us worry about your services uptime.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Better Uptime - We call you when your website goes down
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Site24x7 - Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.
Uptime.com - Everything you require for unified availability monitoring Simple & intuitive industry leading Enterprise-grade features delivered at a fair price, that are continuously improving.
Uptime Kuma - A fancy self-hosted monitoring tool.