Unity has tools like Unity.XR, Unity XR Interaction Toolkit and the new Input System which are made exactly for this purpose: building cross-platform XR apps.

Unity 6 Preview includes new features to make XR development easier, including ‘Composition Layers’ which can significantly increase the quality of text, UI, photos, and videos in XR.

Developers can now take advantage of “Unity’s familiar authoring workflows, robust XR tools, and cross-platform compatibility to create immersive spatial experiences” for Vision Pro.