Windy X is a crosswind calculator for aviation pilots.
You'll just choose runway direction, wind direction and wind speed. That's it. The app will calculate and show the crosswind and head/tail wind components. (The arrows and the numbers next to the runway.)
All the inputs work by touch. Optionally wind speed can be input with keypad.
This first release is totally free. No adds. The next, paid version will be out approx. 3 weeks after the first release. It will include at least global METAR/TAF weather and airport / runway information.
The plain crosswind calculator functionality without the advanced features will be available even after a trial period.