EcoLens — Website Carbon Footprint

See the estimated carbon footprint, energy use, and green-hosting status of any website you visit.

EcoLens shows you the environmental cost of the page you're on — instantly, and backed by real data, not guesswork. Every website has a carbon footprint. Heavy images, bloated scripts, autoplay video, and a chain of ad-tech trackers all cost real energy and real emissions — most of it invisible to you as a visitor. EcoLens makes it visible. WHAT YOU GET 🌱 A+ to F grade — for the page you're actually on, right now Powered by CO2.js, the Sustainable Web Design model built by the Green Web Foundation. Your grade reflects how this page compares to others that have been measured — not a made-up score. ⚡ Green hosting check See whether the site runs on renewable-powered infrastructure, verified against the Green Web Foundation's public hosting registry — plus who's hosting it, when we know. 🔍 Where the weight actually comes from A full breakdown of emissions by data center, network, and device, split into energy used now vs. emissions baked in from manufacturing. Then see it by domain: first-party vs. third-party, with the biggest contributors — trackers, ad networks, embeds — called out by name. 🌍 Localized to your grid Pick from ~200 countries to estimate emissions using local grid intensity instead of a global average. 📊 Your browsing, tracked over time A running history of every site you've checked, with total CO2, your cleanest and dirtiest finds, and how many were green-hosted. 🎯 Accurate mode (optional) The default scan uses your browser's own performance data — fast, and needs almost no permissions. Flip on Accurate Mode and EcoLens reloads the page to measure exact transfer sizes at the network level, including third-party resources the standard method can't see. Off by default; you decide. WHY IT'S DIFFERENT Most "eco" extensions guess. EcoLens computes your grade from the same open-source model used across the web sustainability community, checks hosting against a real registry instead of assuming, and shows its work — every number in the breakdown is one you can inspect, not a black box. PRIVACY EcoLens only looks at the page you're actively viewing, when you open the popup — there's no background tracking of your browsing. Scan history lives in your browser's local storage and never leaves your device. The only network call EcoLens makes on your behalf is a hosting lookup, sent to the Green Web Foundation's public API. Built for anyone who's ever wondered what's really happening behind the page: developers, sustainability teams, or just the curious.