The addon is designed to simplify the control of the number of different types of polygons. You can see how many NGone, Quad and Tris are on the active object. You can also quickly select them by clicking on the corresponding button.
I liked the features of Mesh Check, so I added similar features in Poly Source 1.3.1 .
Added display of mesh for retopology.
If you like the addon and you want to offer an improvement , add to channel for discussion https://discord.gg/DQEz9h3 . I will be glad to improve your experience and use).