Dotcom-Monitor is described as 'Website & Web Application Monitoring'. There are more than 50 alternatives to Dotcom-Monitor, not only websites but also apps for a variety of platforms, including SaaS, Windows, Linux and Mac. The best alternative is UptimeRobot, which is free. Other great sites and apps similar to Dotcom-Monitor are Pingdom (Paid), Freshping (Free), Cabot (Free, Open Source) and StatusCake (Freemium).
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(S), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
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.
StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble. Downtime root cause analysis is included in the free plan to help users diagnose and fix issues.
Pinpoint and solve performance issues in your Ruby, Java, .NET, PHP and Python apps with real user, application and server monitoring. Free accounts can ping a website every 1 minute, from multiple locations around the globe, and send email alerts.
Website/Server monitoring with fast notification via Web, SLACK or E-Mail on issues. What you get: 25 monitors, checked every 5 minutes. Now includes SSL-Certificate validation and port checks. Totally free!.
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).