NerdKey

<p>Powered by NerdTools.co.uk Uptime Tracker (http://uptime.nerdtools.co.uk/) this plugin will add a widget to your sidebar that will show the percentage of availability or uptime for any website over the last 30 days.</p>
<p>In terms of the tracking system, checks are carried out every 5 minutes from different locations and then averages are worked out to form the overall reports from which the graph is generated and shown via an iframe.</p>
<p>Other reports including hourly, weekly and daily can be seen by visiting the Uptime Tracker website directly.</p>
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Uptime Widget

Adds a simple uptime gauge to your WordPress sidebar, showing the percentage of availability for any website over the past 30 days.

Scott Nelle

<p>Uptime Robot uses the uptimerobot.com API to display log messages relating to a site’s uptime. You must have a free uptimerobot.com account to get any use from this plugin.</p>


Uptime Robot

A dashboard widget for monitoring your uptimerobot.com log messages

Uptime Widget vs Uptime Robot