DroidMon Website Monitor
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Provide a URL and a polling interval and let the Web Site Monitor regularly ping the server for status. You can add any number of monitors (the free version supports 1 monitor - just use the in-app purchase to unlock an unlimited number of monitors).
Web Site Monitor includes full support for phones and 7" or 10" tablets and includes a widget.
You can configure notifications and alert sounds for first failure or success. You can also provide a configurable schedule to temporarily suspend monitoring at a certain time of day or night.
Web Site Monitor keeps a history of all ping attempts. The server response is captured for later review. For each ping attempt, the monitor also records the URL, date and time of attempt, the length of the request in milliseconds, and the result.