Cool idea! How did you decide how to limit the colors for flags with many colors? For instance: https://flagpalette.com/kansas-flag-colors Kansas lists 5 colors but there are likely quite a few more.
I guess they don't count the emblem(? I don't know the name for it)
Why include the US state flags but not the flags of state-level administrative districts of other countries?
I mean, I suspect I know why. But the tool would be better if it left them out or included all the others.
Oh I am going to add them soon, this website is a work in progress :)
Why not allow filtering country+color, if I press country, then yellow, it shows me all the yellow flags incl. states
Nice concept. Flag pages are pretty useful. Search doesn't work for me on firefox android.