Grey Heron vs Sea Mariner
Grey Heron and Sea Mariner come from the same Sherwin-Williams collection. Grey Heron reads as greige-grey, while Sea Mariner reads as blue-grey — two distinct hue families, not close cousins. The 58-point LRV gap — 65 for Grey Heron vs 7 for Sea Mariner — means Grey Heron will open up a space more effectively. Where Grey Heron leans warm, Sea Mariner reads cool — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 54.3 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.
Grey Heron vs Sea Mariner in Real Spaces
1 real room side by side. Seeing Grey Heron and Sea Mariner in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Mudroom
In a hardworking space like a mudroom, the depth and warmth of a color reads differently than in a quieter room. The LRV gap is large enough that Grey Heron will make the room feel meaningfully brighter than Sea Mariner would.
Color Details
Grey Heron vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see Grey Heron 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 Grey Heron comparisons
See how Grey Heron stacks up against other well-photographed colors across different brands and tones.
Ammonite reads slightly lighter (LRV 69 vs 65), a gap that shows most in low-lit rooms.
At LRV 83 vs 65, White Dove is decisively the brighter choice.
At LRV 65 vs 6, Grey Heron is decisively the brighter choice.
Grey Heron reflects far more light (LRV 65 vs 52), opening up a space where Purbeck Stone encloses it.
Grey Heron reflects far more light (LRV 65 vs 30), opening up a space where Evergreen Fog encloses it.
At LRV 65 vs 52, Grey Heron is decisively the brighter choice.
Grey Heron reads slightly lighter (LRV 65 vs 60), a gap that shows most in low-lit rooms.
A 7-point LRV gap (65 vs 58) makes Grey Heron the marginally brighter of the two.
At LRV 65 vs 27, Grey Heron is decisively the brighter choice.
Grey Heron reflects far more light (LRV 65 vs 43), opening up a space where French Gray encloses it.
Grey Heron reflects far more light (LRV 65 vs 4), opening up a space where Naval encloses it.
A 10-point LRV gap (65 vs 55) makes Grey Heron the marginally brighter of the two.
At LRV 65 vs 13, Grey Heron is decisively the brighter choice.
At LRV 65 vs 44, Grey Heron is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 65), opening up a space where Grey Heron encloses it.
Grey Heron reflects far more light (LRV 65 vs 21), opening up a space where Artichoke encloses it.
Their light reflectance is nearly identical (LRV 66 vs 65), so neither reads brighter in a room.
A 10-point LRV gap (74 vs 65) makes Shoji White the marginally brighter of the two.
At LRV 83 vs 65, Snowbound is decisively the brighter choice.
Grey Heron reflects far more light (LRV 65 vs 51), opening up a space where Pigeon encloses it.
At LRV 65 vs 12, Grey Heron is decisively the brighter choice.
At LRV 65 vs 8, Grey Heron is decisively the brighter choice.
A 3-point LRV gap (68 vs 65) makes Skimming Stone the marginally brighter of the two.
Grey Heron reflects far more light (LRV 65 vs 41), opening up a space where Dix Blue encloses it.
At LRV 65 vs 12, Grey Heron is decisively the brighter choice.
At LRV 65 vs 45, Grey Heron is decisively the brighter choice.
Grey Heron reflects far more light (LRV 65 vs 31), opening up a space where Pale Green encloses it.