Tools
Open a card for a full guide and a browser-only tool — no uploads, no server round trips. Curated external picks sit below.
External picks
4 curated · opens in a new tab@cometweb/carbon-badge
Lightweight website carbon footprint badge for your pages — npm package for teams and static sites.
External Ecology
Open in new tab
Ecograder
Sustainability score with actionable recommendations.
External Ecology
Open in new tab
Green Web Foundation
Directory and APIs for green hosting verification.
External Ecology
Open in new tab
Website Carbon Calculator
Rough CO₂ estimate per page view and hosting context.
External Ecology
Open in new tab
What “in-browser” means
Every built-in tool runs in your tab — no payload leaves your browser, no analytics tracks what you paste. Hashes use the Web Crypto API, JSON parses with the engine’s native parser, and tokens are decoded with atob plus a TextDecoder. We mention what each tool does not verify on its own page.