This is a PWA developed for GSoC, project proposal.

The App is Hosted Here. It can also be installed by clicking install icon whcich appears on the address bar of the browser.
As of now the system-data page is configured to show a CPU utilization chart, which shows the average utilization of all the cores in your cpu. I have tested it on my machine which have 2 cores and 2 threads.

[Screenshots]

Requirements

The only requirement is to Download the "Chrome-extention" file from the repo and add it to your browser as a Chrome extention, and then open the link and visit system-data. Then you will be able to see the CPU utilization chart.