All of our tools are open source and free to use. Please attribute us, and we welcome you tell us how you used them and what you’d like to see improved. To keep everything up-to-date and available to all, please consider making a donation and supporting a fossil-free internet.
Want to know how other organisations found green alternatives and managed their carbon emissions? Check out our case studies.
Our tools can help you
Check if a website is running on green energy
Find verified green hosting providers
Build carbon metrics into your own digital services
Discover or use sustainability data
Open Source and Open Data
All our tools are published under a Creative Commons ShareAlike Attribution License (CC BY-SA 4.0) unless otherwise noted. Check out our developer documentation and open source repositories on Github.
Check if a website is running on green energy
Green Web Check
Find out whether a website is hosted by a verified green provider.
Green Web Dataset API
Integrate and automate real-time checks against the Green Web Dataset.
Green Web Browser Extension
Browse the internet and see in real-time if a website runs on green energy.
Find verified green hosting providers
Green Web Directory
Quickly find verified green hosting providers in a curated list. Our new Directory is in beta.
Build carbon metrics into your own digital services
Grid-aware websites
Our toolkit makes it much easier to turn any website grid-aware.
CO2.js
Estimate the emissions related to your use of apps, websites and software with the help of this JavaScript library.
IP to CO2 Intensity API
Check the carbon intensity of an IP address based on its real-world location.
Grid Intensity CLI
Surface, monitor, and understand the carbon intensity of the code you run.
Discover or Use sustainability data
Carbon.txt
Carbon.txt is a single place to look on any domain – /carbon.txt – for public, machine-readable, sustainability data relating to that company.