Welcome to Spin-A-Wind.
Spin-A-Wind is a pilot's tool for iPhone, iPad, iPod Touch and now Android to calculate the headwind and crosswind components for a runway. Since its introduction, features have been continually added, including temperature conversion, altitude calculations and true airspeed. It is available for purchase on the iTunes app store, Google Play and the Amazon Appstore for Android.
The newest version is 2.3, and adds the true airspeed calculator, as well as relative humidity, heat stress and moist air density altitude calculations.