Breton Blue vs Functional Gray
Breton Blue (Dulux) and Functional Gray (Sherwin-Williams) come from different manufacturers. Breton Blue reads as blue, while Functional Gray reads as greige-grey — two distinct hue families, not close cousins. The 27-point LRV gap — 37 for Functional Gray vs 10 for Breton Blue — means Functional Gray will open up a space more effectively. Where Breton Blue leans cool, Functional Gray reads warm — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 37.3 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Breton Blue vs Functional Gray in Real Spaces
4 real rooms side by side. Seeing Breton Blue and Functional Gray in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Functional Gray reflects noticeably more light off the walls, making the space read more open than Breton Blue.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Functional Gray returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. Functional Gray returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. Functional Gray returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Breton Blue vs Functional Gray Simulated Comparison
5 simulated room previews — drag the slider on each to see Breton Blue on one side and Functional Gray on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Breton Blue comparisons
See how Breton Blue stacks up against other well-photographed colors across different brands and tones.
