There are several sites, that do that: https://builtwith.com/ https://builtwith.com/ https://sitereport.netcraft.com/ https://sitereport.netcraft.com/ https:

There are several sites, that do that: https://builtwith.com/ https://builtwith.com/ https://sitereport.netcraft.com/ https://sitereport.netcraft.com/ https://www.wappalyzer.com/ https://www.wappalyzer.com/ https://w3techs.com/sites https://w3techs.com/sites Of course, there are issues, some are freemium, not everything can be detected, but it is a good starting point.