There is no absolute best tool. Ecobalyse is the best option for a brand starting out or with fewer than 200 products: free, official, sufficient. Carbonfact becomes the best choice once the catalogue exceeds 500 products and publication must be automated. Fairly Made is the best choice when supplier traceability is the real barrier. Glimpact is the best choice for brands operating across European markets. The right tool depends on your context, not an abstract ranking.
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