The best alternatives to WhatRuns are Webapplizer, SiteStacks for Chrome, and Hunter. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Multilingual Speech-to-Text API with superhuman accuracy
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.
Hunter is the leading solution to find and verify professional email addresses. Start using Hunter and connect with the people that matter for your business.
My Codeless Website is a website scanner that detects themes, page builders, plugins, and tracking tools. It's a super simple tool to get a quick summary of any website.