Wappalyzer is a browser extension that uncovers the technologies used on websites. It detects content management systems, eCommerce platforms, web servers, JavaScript frameworks, analytics tools and many more.
Brilliant and simple tool to check what tech stack your prospects leverage. Makes segmenting and filtering of prospects better and dialogue more relevant.
Now called Wappalyzer, I think this is one of my most used chrome extensions. I am still a big fan of BuiltWith for extensive analyzing of a site's technologies, but from a UX and quick scan, Wappalyzer is by far the best.
