Gateway Gray vs Sea Mariner
Gateway Gray and Sea Mariner come from the same Sherwin-Williams collection. Gateway Gray reads as greige-grey, while Sea Mariner reads as blue-grey — two distinct hue families, not close cousins. The 35-point LRV gap — 41 for Gateway Gray vs 7 for Sea Mariner — means Gateway Gray will open up a space more effectively. Where Gateway Gray leans warm, Sea Mariner reads cool — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 42.3 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Gateway Gray vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see Gateway Gray on one side and Sea Mariner 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 Gateway Gray comparisons
See how Gateway Gray stacks up against other well-photographed colors across different brands and tones.
