1. Free Website Uptime Monitoring

  2. With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.

  3. StatusCake | Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring

  4. 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.

  5. Uptime & performance monitoring for websites and APIs.

  6. Pingometer is a service that monitors the uptime, downtime, and performance of websites. Get 24/7 monitoring - sign up for your FREE account today!

  7. updown.io is a HTTP(S)/TCP/ICMP monitoring service which checks periodically the URL you want and reports back any anomaly.

  8. RapidSpike is an uptime and performance monitoring service for websites and web applications.

  9. Downtime Monkey: website downtime alerts & uptime monitoring worldwide.

  10. Port Monitor is an easy tool that does website and server monitoring 24/7 every 60 seconds for free. It records uptime, performance and downtime causes

  11. SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.

    freemium $6.95 / Monthly (5 Servers, 25 Monitors, 30 day retention)

  12. AlertBot provides availability and performance monitoring from an end user perspective.