Having a PC app communicate with a web based application

Hey guys, I am thinking about starting a new project. I want a VR room-planning kind of app. The basic structure as I imagine it is the VR app where you are just in an empty white room and a Web based application (not necessarily made with Unity ) where someone can add an object in the room and it spawns for the VR player. It's relatively simple, I am just not sure how I get those two apps to talk to each other. So my question is what do I need to know to make the Web part of it. Thank you!