The virtual-reality standard developed by the Khronos Group for access across different devices is OpenXR.
OpenXR is an open standard and application programming interface for virtual reality and augmented reality. The Khronos Group, an industry consortium known for graphics standards, manages its development. OpenXR aims to let applications work with multiple headsets and runtime systems without requiring a separate platform-specific integration for every device.
The 1.0 version of the OpenXR specification was released in 2019. It defines common ways for software to communicate with XR runtimes, handle sessions, obtain tracking information, and interact with input devices. Vendors can provide conformant runtimes for their hardware.
OpenXR is different from OpenGL and Vulkan, which are graphics APIs rather than XR-specific standards. WebXR is a web platform API for immersive experiences in browsers. Applications may use graphics APIs underneath an OpenXR integration, but the standards serve different roles.