Question: I'm looking for a tool that enables users to create digital twins of physical spaces using a smartphone camera.

If you want a tool to create digital twins of physical spaces with a smartphone camera, Matterport is a good option. Matterport offers a full-stack platform for capturing, collaborating on and analyzing 3D digital twins. With 3D camera capture, virtual tours and AI-based analytics, it's popular in real estate, hospitality, retail and manufacturing for property marketing and project management. Mattersport offers a variety of pricing plans, including a free option, so it can accommodate different business needs.

Another option is Polycam, which lets you create 3D models with your iPhone, iPad, Android or web browser. It also offers LiDAR scanning, photogrammetry and 360-degree panorama capture. With augmented reality viewing, collaboration and a free app, Polycam is easy to use and offers both free and paid options, so it can accommodate different needs. That makes it a good option for creating digital twins of different spaces.

If you want more powerful photogrammetry software, PIX4D offers a full-featured suite for capturing, processing and analyzing photos from cameras and drones. It's commonly used in surveying, architecture and construction, but it also has a smartphone-based option for 3D scanning. PIX4D offers flexible processing options, collaboration tools and a variety of subscription plans, so it's good for professional use in many industries.

If you want a foundation for augmented reality (AR) programming, EasyAR is a good option. EasyAR includes tools for spatial mapping, motion tracking and image recognition. It offers features like 3D point clouds and meshes, multi-sensor fusion and city-scale AR clouds, and supports a variety of devices. EasyAR's flexible API and variety of subscription tiers means it can accommodate different project requirements, from personal to enterprise.