How to tell if a site is WordPress?? and what theme are they using? Below as few websites that will check if your sites is using WordPress and it also tell you which theme they are using and what plugins.. Very useful if you find a website you like and want to see if its WordPress related and maybe see what theme is it using..So beside checking the website footer for Build with WordPress, or checking the source code..Click below on any WordPress checking website to find out if the site is build using WordPress CMS. Easy to follow tutorial with step-by-step instructions how to start a blog or how to make a website using WordPress with build in drag and drop page builder.