Pryme incorporates your unique physiology as well as your activity and environment when determining your hydration needs. What makes this different is that it emphasizes two important points - that everyone is different, and that timing is critical.
If you were going to run a marathon today, would you drink all of the water you need in the morning? Probably not. You need to refuel effectively, at the right time. Pryme handles all of this in the background while keeping it specifically tailored to your needs.