Carbonlite — Website Carbon Footprint

Measure the carbon footprint of any website in real time. Get a grade (A+ to F) and actionable recommendations to reduce emissions.

Carbonlite measures the real-time carbon footprint of every website you visit and gives developers actionable recommendations to build a cleaner web. 🌿 HOW IT WORKS Carbonlite uses the Sustainable Web Design Model (SWDM v4) to calculate CO2 emissions based on: • Data transferred (images, scripts, CSS, fonts) • Hosting type (green vs standard data center) • Network and device energy consumption • Embodied carbon from hardware manufacturing 📊 FEATURES • Real-time carbon grade (A+ to F) for every page • Resource breakdown by type (images, JS, CSS, fonts) • Industry benchmark comparison (e-commerce, blog, SaaS, news) • Actionable fix recommendations with estimated savings • 7-day trend tracking per domain • Carbon budget alerts • Green hosting detection via Green Web Foundation (opt-in) • Dark mode support • Export history as JSON 🔒 PRIVACY-FIRST • All data stored locally on your device — never sent to our servers • Green hosting check is opt-in and sends only hostnames (not full URLs) • No tracking, analytics, or telemetry • No personal data collected • Incognito mode fully respected — zero data persisted in private windows 🎯 BUILT FOR DEVELOPERS Carbonlite is designed for web developers who want to understand and reduce the environmental impact of their websites. Unlike consumer carbon trackers, Carbonlite provides: • Per-resource breakdown with file-level detail • Copy-paste optimization checklists • Format-specific image compression suggestions • Third-party script impact analysis • New vs returning visitor comparison 📐 METHODOLOGY Based on the Sustainable Web Design Model v4 (sustainablewebdesign.org): • Energy model: Data center (0.055 kWh/GB) + Network (0.059) + Device (0.080) • Grid intensity: 480 gCO2e/kWh global average (Ember 2023), with 11 regional options • Embodied carbon: +16% for hardware manufacturing • Green hosting: 50 gCO2e/kWh for renewable-powered data centers 🔧 PERMISSIONS EXPLAINED • sidePanel: Display the carbon analysis UI • storage: Save settings and history locally on your device • tabs: Identify Chrome internal pages and respect Incognito privacy • webNavigation: Detect page loads for automatic analysis • Content script: Collect resource sizes via Performance API (no page content is read) • thegreenwebfoundation.org: Green hosting check (opt-in only, disabled by default) Questions? Report issues at github.com/rapidminds-tech/carbonlite