UptimeRobot
Monitor websites, services and scheduled jobs and send alerts when they fail.
Detect blank web apps with checks that open the page in a browser

Pingbuddy checks whether a web app actually renders for visitors. A server can return a successful response even when a JavaScript error leaves the page blank. Pingbuddy opens the app in a browser to look for that failure, then sends an alert with a screenshot and a suggested prompt for investigating the cause. A dashboard brings together site status, response times and recent incidents. The separate public checkup can inspect issues such as an expired certificate or a paused backend before a site is added for ongoing monitoring.
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