What are some alternatives?
When comparing Pingoscope and Pingdom, you can also consider the following products
UptimeRobot - Free Website Uptime Monitoring
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.
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.
upTom - Free simple website monitoring tool.
RapidSpike - RapidSpike is an uptime and performance monitoring service for websites and web applications.