Abstract: Mixed reality collaboration applications and a mixed reality collaboration platform providing mixed reality collaboration are described. The platform can include a data resource with supported device information, registered user information, and session data stored on the data resource. Two or more devices (e.g., a first user device and a second user device) with different operating systems can register with the platform. The platform can store registration information, such as user device information and user information, received from the two or more devices in the data resource as part of the registered user information. The platform can receive, from the second user device, session data in a format compatible with the second user device operating system. The platform can then access the supported device information and communicate the session data to the first user device according to the API calls for the first user device.