I wonder how it's made. What tools did you use? What language?
Generally curious about inner workings of such an application.
Nice app! An idea to make it slightly more minimalistic and functional. Remove the "Hex" button and just cycle through different modes when user clicks on the code field. Show something like [RGB: 128,10,255], [HSB: 269, 245, 255], [HEX: #800AFF] and remember last mode that was used.