Beholder is described as 'Powerful Photogrammetry application built by Beholder Vision Ltd that enables you to build 3D models of objects from sets of photos. Beholder can either be used online as a SaaS, or alternatively if you have a Windows PC with an NVidia GPU then Beholder can be used' and is an app. There are more than 10 alternatives to Beholder for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best Beholder alternative is Meshroom, which is both free and Open Source. Other great apps like Beholder are Agisoft Metashape, Regard3D, Scaniverse and WebODM.