[TheKnack]

I used this to replace Visualping.io. The only features it lacks compared to VisualPing is a GUI for selecting page elements to monitor and fully rendered diff results. It either monitors the whole page or you can add a CSS selector manually.

[biggunz]

It accepts CSS filters - click on EDIT, Then "Filters & Triggers" and there you can fill in a CSS filter, more stuff coming soon :)