Love Windy app, but as a green colorblind I would like to see more than one (1) color theme.
You can change the color of most layers by yourself and replace the Green by another color.
In "Settings", select "Modify layer color". (On the image below, note that I have changed the colors on my side, so they are different from what you see on your screen for Wind)
To modify for instance the Green corresponding to 14 knots, you can modify directly the RGB values (using a conversion chart) OR by clicking on the color you open a small pop up and you can change the color with the slider 1 and adjust the brightness/density with slider 2.
At the end "Save" if you are satisfied.
You can do it for Wind and for the other layers.
If you need further help, just let us know.