Wappalyzer technology discovery browser plugin

in Pentesting
Does anybody use the Wappalyzer browser plugin for website technology discovery?
Have you found it to be accurate?
Do you prefer another tool? Builtwith is good, but it works only on external sites (no intranet). Wappalyzer works both internally and externally.
Comments
I rarely use these page extension tools. I don't see myself looking for alternatives, wappalyzer does a good enough job for whatever my needs are. These tools usually just point me in the right direction before I do a full deep dive into the target page's technologies.
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