Vercel has great fonts, but which is it?

I'm cloning Vercel's landing page, downloaded Vercel's Geist font pack (Thanks Theo, pretty cool I can just add to Font Book) but when inspecting their website, I still can't figure out which font they're using for which element (bold, semi, thin...) 😡 How would you figure this out? What am I missing?

Solution:

Just use the computed tab in chrome dev tools. For example they're using font weight 600 here

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