I use a similar app called Name That Color — https://chir.ag/projects/name-that-color/#6195ED
I like sharing descriptive names with designers instead of naming everything "light blue" "dark blue" "not quite as light but still not dark blue" etc.
This new thing is tons of fun but seems a bit less practically useful.
You just reminded me that my app turned 18 a few months ago.
Another dev, Daniel Flück, extended the app to help color blind users: https://www.color-blindness.com/color-name-hue/