|Pricing URL||Official UptimeRobot Pricing|
|Details $||freemium $5.5 / Monthly (Pro Account)|
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.
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.
RapidSpike - RapidSpike is an uptime and performance monitoring service for websites and web applications.
Monitis - Monitis specializes in IT monitoring, covering server, website, app monitoring and more within an all-in-one monitoring platform.
Apex Ping - Uptime & performance monitoring for websites and APIs.