What are some alternatives?
When comparing Pingoscope and Downtime Monkey, you can also consider the following products
UptimeRobot - Free Website Uptime Monitoring
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 - StatusCake | Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Apex Ping - Uptime & performance monitoring for websites and APIs.
upTom - Free simple website monitoring tool.