This is a nice service. You've even compiled some interesting data on the wide range of web sites you've evaluated.<p><a href="https://siftery.com/categories/languages-and-frameworks/languages" rel="nofollow">https://siftery.com/categories/languages-and-frameworks/lang...</a>
I've found BuiltWith effective for this kind of thing - especially regarding lead gen - but they are quite expensive. If you can provide a similar service and cheaper I might have paid for it. (Not so much these days as I'm working on something else).
Cool stuff! If you want to add more detection strategies, you might find <a href="https://page.rest" rel="nofollow">https://page.rest</a> useful. It can help you to easily check meta tags, script sources and headers for hints.
I'd also recommend this site if you are interested in see what is trending, and the tech stack by company. <a href="https://stackshare.io/stacks" rel="nofollow">https://stackshare.io/stacks</a>
It gets my website <i>slightly</i> wrong because it claims I'm using iwantmyname.com as a host. The domain actually points to an AWS S3 static website bucket. I think that makes AWS the host.