The following tutorial will show you a quick way to check if a site is built with WordPress, Joomla, or Drupal.
Using the technique, you can also quickly see some of the other technologies used for the site.
Let's get started.
Go to the Wappalyzer download page and install Wappalyzer for your browser. The process will be relatively automatic and quick.
Once installed, it's as simple as navigating to a web page and clicking the Wappalyzer icon. For example, the above screenshot shows what Wappalyzer displays for OSTraining.com.
Other Useful Ways to Check
If you're using WordPress we have other ways to check: http://www.ostraining.com/blog/wordpress/site-built-in-wordpress/.
If you're using Drupal, we also have multiple ways to check: http://www.ostraining.com/blog/drupal/5-ways-drupal/
I hope this tutorial was helpful, saves you time, and makes browsing the internet a bit more enjoyable...it is fun quickly seeing what technologies power sites. You'd be surprised that many are ones that you're familiar with.