I could never find a quick and easy (free) tool to check the sites I was working on for missing Google Analytics code, so I ended putting together GAChecker.com. Just put in your domain and let the tool do the rest. It will crawl your entire site, and afterwards you can view the results in a table or export your results to a CSV for easy analysis. If you’re interested, you can check your site’s Google Analytics code here.
Here’s a snapshot of the tool:
There are tools that do basically the same thing (like Screaming Frog), but there’s none that I know of that are free. There’s currently a 5000 URL limit; if you need to crawl more just get in touch. I’d also like to give a shout out to Shashank Singla for helping set up a lot of the trickier Python and Ubuntu stuff.