Cyber Apps have developed Psychro, an App for psychrometric calculations. Currently it is available for use on Android devices and may be downloaded from Google Play Store. It is a valuable tool for HVAC&R engineers and designers. Pyschro covers all important processes and calculates properties of air for a wide range of input options. It can also produce neat graphics. Reports can be saved to a text file. Calculations can be made for any selected altitude, both in SI and IP units.