Does anybody know if Stripe uses some specific tool to draw their diagrams, like those on this blog? They're very well made and the branding is consistent and b

Does anybody know if Stripe uses some specific tool to draw their diagrams, like those on this blog? They're very well made and the branding is consistent and beautiful. I'd be curious if it was something one of their designers does by hand, or if they have some tool that allows them to create their (block) diagrams with such unified branding.