> Nowhere is it stated that it is a score out of 100.

It says it right on the homepage. Twice. Once for people, once for organisations. It’s right there in green: “BEST (SCORED OUT OF 100)”. And if you go into any of them, you see a score like N/100.

Found the methodology page, and it clarifies it goes from -100 to 100.

https://goodindex.org/methodology#:~:text=How%20Scoring%20Wo...