Well, a few major differences I&#x27;m seeing at a glance:<p>- X3DOM supports Flash as well as an X3D plugin. A-Frame is specifically targeting WebGL and has a much smaller surface area<p>- A-Frame is based on ThreeJS rather than a custom engine<p>- A-Frame seems to be embracing modularity a lot more than X3DOM, and it seems likely that users will be able to build highly specialized components published as npm modules (much like we see with React components)<p>- A-Frame is specifically focused on VR out of the box<p>- The markup language and intended target audience is significantly different