CO2estimeter

by alexander.zur.bonsen@gmail.com · Education

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Web extension for estimating the CO2 emissions of browsing activity

Users

−2 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#183K

#153K among extensions

Version

1.0.6

updated 3 May 2025

Users

monthly, 2 years

Latest, 16 Oct 2026: 12 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CO2estimeter

Get an estimate of the CO2 emissions of your web browsing activity based on the the Sustainabale Webdesign Model v4 (https://sustainablewebdesign.org/estimating-digital-emissions/). The model uses the number of bytes that are transferred when loading a web page, to estimate the associated cabon footprint. CO2estimeter monitors the transfer sizes of web pages, via the browser's Performance API, and computes carbon emissions from that with the formulas of the Sustainable Webdesign Model v4. You can find more information on the extension's GitHub page (https://github.com/alexzurbonsen/co2estimeter). If you encounter bugs, please also visit the GitHub page and file an issue. Much appreciated.