User:Lukaterra/Comparison of free website monitoring systems

Description
The following table compares general and technical information for a number of free remote website monitoring systems. Some are free, some are commercial with a free plan. Please see the individual products' articles for further information.

Legend

 * Product Name : The name of the system, linked to its Wikipedia article.
 * Interval : Monitoring frequency in minutes.
 * Websites : Number of websites, pages or protocols allowed per account.
 * Nodes : Monitoring servers in different geographic locations
 * E-mail Alerts : E-mail outage alerts
 * SMS Alerts: SMS outage alerts.
 * Mobile App: Mobile application with push outage alerts
 * Monitors: Type of protocols monitored