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bluechoochoo I'd say medium accuracy. It occasionally misses the CMS entirely, the JS and media parts of the stack are pretty accurate.
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bluechoochoo (that includes analytics packages, seems pretty accurate there too)
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bluechoochoo Widgets and CDN are less accurate. I wouldn't rely on its guess for operating system at all. And it occasionally gets ad tags.
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bluechoochoo I dunno about base language (PHP, Python, Ruby, etc...). Ran a few tests on sites I know the details of and it seems to get it
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bluechoochoo Also, it should always be able to get hosting provider & HTTP server.