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.
Free real-time monitoring for 50 sites every 5 minutes. Custom alerts through email, SMS, calls, and apps like Slack, PagerDuty, and more. Use status pages and mobile apps for easy management.
Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime, downtime, and the performance of your website as experienced by visitors.
Healthchecks.io is a service for monitoring cron jobs and similar periodic processes:
Uptime.com: Real-time availability monitoring & response for preventing website downtime. Your complete website monitoring solution.
SaaS monitoring tool for linux servers and websites. Think up-time robot but with more features. You can monitor your linux hosts, windows hosts under development.
PushMon is a new kind of cloud-based monitoring system. Instead of checking public facing servers on a regular basis, PushMon will wait for pings from the objects being monitored. These objects are usually batch jobs, scheduled/cron scripts, backups, or test scripts, but really...
Pingbreak is an original and free monitoring service. Get notified through Twitter if your website is down. Pingbreak checks all of your websites each minute and alert you instantly by Direct Message (DM)
With webcron you pay per request and you can choose the monitoring frequency to your linking. When your website goes down, webcron can send you either an email or a text message (SMS).
Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
Netthrob runs automated verification checks on your website every three minutes from five different geographies and immediately informs you through Phone, SMS & Email when your site goes down.
Monitor Scout is a leading website and server monitoring company, with a wide selection of flexible, high quality services. The reliable web-based system monitors your websites and server 24/7 and reduces your downtime with immediate email/SMS alerts.
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Same core feature set for cron monitoring, more monitors per tier with better pricing.