Sea Mariner vs Thunder Gray
Sea Mariner and Thunder Gray come from the same Sherwin-Williams collection. Hue-wise, Sea Mariner belongs to the blue-grey family and Thunder Gray to the grey family. Their light reflectance values are nearly the same — 7 vs 9 — so neither will read significantly brighter or darker than the other. Where Sea Mariner leans cool, Thunder Gray reads neutral — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 12.3 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Sea Mariner vs Thunder Gray in Real Spaces
1 real room side by side. Seeing Sea Mariner and Thunder Gray in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
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. Sea Mariner reads more restrained here, while Thunder Gray adds a sense of enclosure and warmth.
Color Details
Sea Mariner vs Thunder Gray Simulated Comparison
5 simulated room previews — drag the slider on each to see Sea Mariner on one side and Thunder 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 Sea Mariner comparisons
See how Sea Mariner stacks up against other well-photographed colors across different brands and tones.
Agreeable Gray reflects far more light (LRV 60 vs 7), opening up a space where Sea Mariner encloses it.
At LRV 58 vs 7, Accessible Beige is decisively the brighter choice.
With LRVs of 7 and 4, the two reflect almost the same amount of light.
Pure White reflects far more light (LRV 84 vs 7), opening up a space where Sea Mariner encloses it.
At LRV 74 vs 7, Shoji White is decisively the brighter choice.
At LRV 83 vs 7, Snowbound is decisively the brighter choice.