Another type of badge you may run into on GitHub looks something like this:
Like other services, code climate is free for OSS, but it’s a little hard to find the open source signup page. There really is no “signup”, you just enter the name of your GitHub repo and your email address and code climate will start analyzing the repo and send you a link to the results page and README badge links.
Code Climate for private repos is a pay service and provides some additional services like integration with TravisCI, Semaphore, or Solano for code coverage, and Pivotal Tracker, Lighthouse, or GitHub to track issues. Security analysis is also only available in the paid service.
Pricing, at the time of this writing, started at $24/month solo plan (1 user/1 repo). The most popular plan is the $99/month Team plan (5 users/5 repos).