Color systems
RGB is a space, not a single screen color
RGB is the language of light, but the same numbers can behave differently across screens, profiles, and viewing conditions.
Three channels, many contexts
RGB describes how red, green, and blue light combine on a display. It is a useful model, but it does not mean that every display emits the same red or shows the same blue at the same numeric value.
That is why a palette can feel slightly different between a laptop, a phone, and a calibrated production screen. The numbers are a starting point; the viewing context completes the color.
Keep the hand-off explicit
Treat HEX as a convenient notation for a digital color, not as a promise of physical accuracy. Keep the original values, the intended use, and any color-space assumptions with the project.
For a UI, test the actual palette in its surfaces, text sizes, and states. A color that looks right in a swatch can still fail when it has to carry hierarchy or remain readable beside an image.