Get RealFit on the Oculus Quest:

Do you own one of these mobile VR headset?

• Oculus Quest
• Oculus Quest 2

Then this is the best place to get RealFit:
RealFit for Quest

Get RealFit on Steam:

Do you have a PC and own one of these headset?

• HTC Vive
• Oculus Rift
• Valve Index
• Windows Mixed Reality

Then the Steam Store is the best place to get RealFit:
RealFit on Steam