Onyx vs Celestial Blue
Onyx is a Benjamin Moore color while Celestial Blue comes from Little Greene. Onyx reads as grey, while Celestial Blue reads as blue-green — two distinct hue families, not close cousins. At LRV 44 vs 5, Celestial Blue will read as the brighter of the two — a 39-point gap that matters most in north-facing or low-light rooms. The tonal difference — Onyx's red character against Celestial Blue's green — becomes most visible against white trim or in morning light. At ΔE 51.0, these are genuinely distinct colors — a strong contrast if used together, or a meaningful choice between two different directions. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Onyx vs Celestial Blue in Real Spaces
4 real rooms side by side. Seeing Onyx and Celestial Blue 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
Living rooms test a color across a full range of conditions — morning sun, afternoon shade, and evening lamp light all shift how both of these read. Celestial Blue returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Bedroom
Bedroom walls are often seen under warm artificial light, a context that shifts both colors from how they look on a chip. The LRV gap is large enough that Celestial Blue will make the room feel meaningfully brighter than Onyx would.
House
At full exterior scale, the difference between these two colors becomes much easier to judge than from a small chip. The LRV gap is large enough that Celestial Blue will make the room feel meaningfully brighter than Onyx would.
Front Door
Front doors are seen in isolation against the rest of the facade, which makes them a high-stakes surface where even subtle differences matter. Celestial Blue returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Onyx vs Celestial Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Onyx on one side and Celestial Blue 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 Onyx comparisons
See how Onyx stacks up against other well-photographed colors across different brands and tones.
