I like WP Umbrella for testing the reliability of a plugin's code. (To see if it generates critical/visible errors at the PHP level or not). Good work.

Good interface, monitoring website performance, website uptime, updating websites plugins, theme and wordpress and so many other features which makes it a unique tool in its category

With this plugin, you can manage one or multiple sites at the same time. You will get an accurate information with a lot of advantages such as: – Reliable alerting systems (uptime, downtime) – PHP errors monitoring – Debugging of PHP errors – WordPress error – Security monitoring With this plugin, you can rest assured that your site won't get down