If all you want to know is who accessed a site, with which browser, how long for, and which pages they looked at then you could get all that from your webserver&#x27;s log files without writing any code. On the other hand, to build something that&#x27;s robust, relatively scalable, works across browsers and devices, and can give you an event watching platform like GAnalytics gives you (eg the useful bit), that is far from trivial.