Moz Page Authority is a grading system built by Moz. With this grading system.
Page Authority Checker is an online web-based tool which allows you to check Moz page authority of any webpage.DA, PA Checker is free & easy to use.
Moz replaced their Open Site Explorer with a new tool called Link Explorer which can still be used as a domain authority checker,
Page Authority (PA) is a score developed by Moz that gives suggestions on how well a certain page will rank on SERP. Similar to Domain .
How Do I Check my website Page Authority and Domain Authority ?
To check the domain authority of a website, simply enter the URL into the input box above and click go fetch. You'll then be able to see your score in the DA column. If you have several to check, just enter one URL per line up to a maximum of 20 Website.