SpeedTracker
This is a great free service for doing a bit of performance monitoring on your site. It uses WebPageTest and you do all the set up via a Github repo that then displays the results using Github Pages.
It won’t give you the power or control of Calibre but it’s a handy option for smaller sites. Here are the results for adactio.com running on a Moto G over 3G.
Obrigado, Eduardo!