WhatRuns is a free technology lookup tool for developers, designers and salespeople to discover the technologies used on any website. Available for free on Chrome and Firefox. Featured 3 years ago.
Comparing tech stacks? Beyond WhatRuns, try SiteStacks for Chrome for instant, advanced lookups, or Hexofy to capture structured data from any page. Need design clues? Font Face Ninja reveals a site’s webfonts. Building your own tools? Plasmo streamlines extension development. Want a lighter touch? RatherNice makes browsing brighter.