The Immersive Mental Health (IMH) app is an advanced VR relaxation application designed specifically for smartphone-based VR headsets. We chose to develop an app for smartphone-based VR headsets because of their lower price compared to stand-alone VR headsets, making them accessible to a wider group of people. A smartphone is of course required for a smartphone-based VR headset, but this is a common investment that many people have already made. What's more, smartphone-based VR headsets are extremely easy to use: you don't need any controllers, you just need to place your smartphone in the headset.