isUp is described as 'Website/Server monitoring with fast notification via Web, SLACK or E-Mail on issues. What you get: 25 monitors, checked every 15 minutes. Now includes SSL-Certificate validation and port checks. Totally free!' and is a Uptime Monitor service in the network & admin category. There are more than 50 alternatives to isUp, not only websites but also apps for a variety of platforms, including SaaS, Self-Hosted, Linux and Windows apps. The best isUp alternative is Uptime Kuma, which is both free and Open Source. Other great sites and apps similar to isUp are UptimeRobot, Pingdom, Instatus and StatusCake.
Communicate your web service, app, or developer API's uptime status & downtime issues with our customized hosted status page. We are known to offer more features & bandwidth than our competitors.
The most frustrating part for the website owner is the failure of the internet connection with their site. If you find that you cannot access your website. Do not be panic. Most website owners feel that there is some kind of problem in the backend/server's end.
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