It's a very simple to use 3D modeling app, instead of the complicated vertex-to-vertex app like Blender or Maya, It's more akin to modeling in something like Roblox Studio or Rec Room, using simple shapes to its best creativity! Best part is, you don't even need a good computer (or laptop) to run it, as its all streamed directly to your browser!
Light cons: Due to it being streamed, A lot of things can lag behind due to internet, following that, Womp is an online only app meaning there's no offline support (though you'd probably need a pretty good device to run it offline anyway). Building very detailed models is much harder (but definitely doable!) Due to only using Spheres, Cubes, and Cylinders.