These three platforms serve different purposes and are often used together rather than as alternatives.
CDP (Carbon Disclosure Project) is a global environmental disclosure platform where large companies report their environmental data to investors and stakeholders. It's primarily used for public reporting and investor relations.
EcoVadis is a supplier sustainability assessment platform that evaluates environmental, social, and governance (ESG) practices and assigns scores that buyers use to assess supplier performance. Emissions are one of many criteria it covers.
Green Project is specifically designed to help suppliers measure, manage, and reduce their carbon footprint. Where EcoVadis gives you a rating, Green Project gives you the tools and guidance to improve your practices. Many suppliers use Green Project to gather the data they need to report to EcoVadis.
💡 In short — CDP is for public disclosure, EcoVadis is for supplier assessment and scoring, and Green Project is for measuring and reducing your actual emissions.