Celestial Blue vs Cement grey
Celestial Blue (Little Greene) and Cement grey (RAL Classic) come from different manufacturers. Celestial Blue reads as blue-green, while Cement grey reads as grey — two distinct hue families, not close cousins. The 20-point LRV gap — 44 for Celestial Blue vs 24 for Cement grey — means Celestial Blue will open up a space more effectively. A ΔE of 19.8 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.
Celestial Blue vs Cement grey in Real Spaces
4 real rooms side by side. Seeing Celestial Blue and Cement grey 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. Celestial Blue reflects noticeably more light off the walls, making the space read more open than Cement grey.
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. Celestial Blue returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
House
A full exterior is the most demanding test for a paint color — scale and outdoor light both amplify differences that seem small on a swatch. Celestial Blue returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Front Door
On a front door, the color is both the first and last thing you see — a context where even a modest tonal difference reads clearly. Celestial Blue reflects noticeably more light off the walls, making the space read more open than Cement grey.
Color Details
Celestial Blue vs Cement grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Celestial Blue on one side and Cement grey 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 Celestial Blue comparisons
See how Celestial Blue stacks up against other well-photographed colors across different brands and tones.
