VPD Vapor Pressure Calculator app for iPhone and iPad

Calculate Your VPD and Dial in your grow environment. Using algorithmic suggestions make sure your always maximizing your yield.
This app will help you grow giant Tomatoes!!! VPD is important no matter your grow method hydro, no till, organic.


Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a film of water forms on a plant leaf, it becomes far more susceptible to rot. On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die.

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