Beacon

(https://digitalbeacon.co)

Calculates website’s carbon footprint, including CO2 generated on the first visit and a return visit (after your browser has cached the common site files), and the size of the data transfers required to load it.

Keeps a log of the last 10 times you tested, so you can keep track over time of how improvements you’ve made have impacted emissions

Works as a browser extension in Firefox, Chrome and Brave, but also works like the others - it will give results if provided with a link on the official website (https://digitalbeacon.co)

Benefit:

Provides info both about the first and return visit (when browser has cached the data)

Pricing: Free

Result looks like: