If you're using Tags to better categorize your WordPress Posts, you can use the HelloBar's WordPress Tag targeting rule to trigger a popup based on those tags.
*Please note that this will only work when you install the Latest Hello Bar Wordpress plugin (version 1.0 or above)
To create a WP Tag custom targeting rule, first, you need to access the popup editor page and navigate under "Targeting" > Then click on Create New Custom targeting rule (not available on the free plan).
Create your WordPress Post Tag Rule like as follows
You can create rules with two conditions - includes and not includes. Which will allow you to target a specific popup to a set of pages which either have a particular tag or vice versa.