Energy climate

CO2Stats

Website

Overview

CO2Stats aims to help website owners understand the electricity usage and related carbon emissions associated with site usage, and then helps site owners manage their carbon footprint.

The company calculates the greenhouse gas footprint of visits to your site, based on locations of your visitors and servers, computer types, window and monitor sizes, local fuel mixes, download sizes and times.

Every month CO2Stats purchase Green-E certified Renewable Energy Certificates to offset your site's CO2 footprint. Users can inspect your certificates and other environmental statistics by clicking on your CO2Stats badge.

Company description As recorded 2026-11-08
Energy climateAnalyticsBusinessesSmall businessesSubscription

Founders & team

Alexander Wissner-Gross

Founder

Dr. Alexander D. Wissner-Gross is an award-winning computer scientist, entrepreneur, investor, and author. He serves as President and Chief Scientist of Gemedy and Managing Director of Reified and holds academic appointments at Harvard and MIT. He has received 128 major distinctions, authored 23 publications, been granted 24 issued, pending, and provisional patents, and founded, managed, and advised 27 technology companies with combined exits of over $900 million.

LinkedIn X
Founder profile As recorded 2026-09-15

News & product activity

Sources & observations

Y Combinator

Profile depthverified profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedBoston, MA, USA; Cambridge, MA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented

Source-based assessment · automated evidence rules

The source reports an inactive or acquired company; current product identity needs review.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced people
startup.observe Directory coverage · Sources & method