GA Checker spiders your site, much like a search engine, and identifies which pages contain Google Analytics and/or AdWords tags and which ones do not. The tool currently checks for the presence of the following:
The tool doesn't know how many pages there are on the domain when it starts. It finds new pages by following links, so as it discovers new links the % of links crawled changes. And I suck at coding.
So you don't embarass yourself by reporting on inaccurate data. Make sure all your GA tags are in place so that you get the cleanest data possible.
Nope, not the whole site, although it will give you the first 10,000 pages that were crawled. If you want to crawl a larger site, you'll have to get in touch with me (joshkellett87 AT gmail DOT com, or @jshklt on Twitter).
If GA Checker found your tag, chances are the tag is installed correctly but this isn't always the case. The tool looks for the presence of two key lines of every GA tracking code, the UA ID and a track pageview line. Generally if your tag has these two things, you should be fine, but I would spot check a few pages just in case. The Tag Assistant plugin for Chrome is a good way to do this.
Nope. No GA data is collected and no personally identifiable information is collected either. Crawl away.
Only the standard Google Analytics first-party cookies that any site running Google Analytics uses. GAChecker is 100% third-party cookie-free.