No. vGIS AR runs on Android, iPhone, iPad and Microsoft HoloLens, among other devices. vSite is a browser-based solution meant for scenarios without the use of augmented reality. External devices paired with a mobile device or tablet can improve the experience of vGIS AR, but are completely optional.
To review a list of recommended setups including ones using optional devices, click here.
vGIS also supports most mainstream positioning devices, including Leica, viDOC, Eos, and Trimble. To read more about the optional GNSS devices available to vGIS, click here.