Website authority checker is the same as DA checker, the online tool designed to check and
overview
Domain Authority. Besides, the website authority checker lets you get insights about the number
of
backlinks, referring domains, their penalty risk scores, C-blocks, etc.
PA checker, or page authority checker, is actually an analyzer with the same functionality but
is
mostly
aimed at single page (URLs) overview instead of the whole domain. Still, you can easily use a DA
analyzer as a page authority checker — just enter an exact URL you need to check.