I'm a recreational pilot and the Windy app is by far the best online tool for assessing aviation weather conditions. Just brilliant!
The distance planning tool for VFR is great but I have a few suggestions to improve its usabilty:

1. allow input of the flight routes (3D) from a kml, gpx or csv file, and make these routes available to use again at a later time
2. show the flight path on the vertical profile (above the terrain profile)
3. allow printing of the vertical profile to pdf so that these can be viewed on an iPad by the pilot during the flight

Regards
Gary