Why matching existing wall color is hard without the app
Paint colors shift over time as they age, fade, or react to cleaning. A chip from the current wall is never exactly the original color. Even if you have the original paint can, the batch mixed today may not exactly match the batch mixed years ago.
The app samples the actual color currently on your wall and finds the nearest match in today’s available paint products — accounting for the fact that you are matching the aged color, not the original formula.