It's easier to judge a tool by what people made with it than by its own landing page, so vessa.design/gallery now collects published guidelines worth a look.
Every entry opens the live guideline, the same page its owner sends to clients, and comes with a few lines of our own on what that brand does well. Each one is written by hand, so no two of them read alike.
A guideline joins once it's complete enough to learn from and we've written about it, so the gallery grows slowly on purpose. If your brand is in it and you'd rather it wasn't, write to hello@vessa.design and we'll take it out.