WDT.io is described as 'Use these simple Watchdog Timers to monitor both HTTP servers and scheduled jobs such as cron jobs' and is a website monitoring tool in the network & admin category. There are more than 10 alternatives to WDT.io, not only websites but also apps for a variety of platforms, including Android, iPhone, Linux and iPad apps. The best WDT.io alternative is UptimeRobot, which is free. Other great sites and apps similar to WDT.io are Pingdom, Healthchecks.io, Website Monitoring by Uptime.com and NIXStats.
Dead Man's Snitch makes it quick and easy to know that your cron jobs and recurring tasks are always there doing their jobs. Quickly find out when a cron job fails to run or runs into an error.
ServersUp.net can check a number of different services on different hosts to make sure those services are up and running. It will send alerts when the statuses change.
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