Dock Blue vs Sea Mariner
Where Dock Blue belongs to Little Greene's range, Sea Mariner is a Sherwin-Williams color. Hue-wise, Dock Blue belongs to the blue family and Sea Mariner to the blue-grey family. Sea Mariner (LRV 7) reflects noticeably more light than Dock Blue (LRV 4), a difference of 3 points that becomes especially apparent in rooms with limited natural light. Dock Blue runs blue while Sea Mariner is decidedly cool, which means they'll respond very differently to warm vs cool light sources. The ΔE 8.6 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Dock Blue vs Sea Mariner in Real Spaces
1 real room side by side. Dock Blue and Sea Mariner are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
Dock Blue vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see Dock Blue 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 Dock Blue comparisons
See how Dock Blue stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 4), opening up a space where Dock Blue encloses it.
At LRV 52 vs 4, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 4, Evergreen Fog is decisively the brighter choice.
At LRV 60 vs 4, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 4), opening up a space where Dock Blue encloses it.
Denim Drift reflects far more light (LRV 27 vs 4), opening up a space where Dock Blue encloses it.
At LRV 43 vs 4, French Gray is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 4), opening up a space where Dock Blue encloses it.
Hardwick White reflects far more light (LRV 44 vs 4), opening up a space where Dock Blue encloses it.
At LRV 84 vs 4, Pure White is decisively the brighter choice.
Balboa Mist reflects far more light (LRV 66 vs 4), opening up a space where Dock Blue encloses it.
Shoji White reflects far more light (LRV 74 vs 4), opening up a space where Dock Blue encloses it.
Pewter Green reads slightly lighter (LRV 12 vs 4), a gap that shows most in low-lit rooms.
Skimming Stone reflects far more light (LRV 68 vs 4), opening up a space where Dock Blue encloses it.
Vintage Vogue reads slightly lighter (LRV 12 vs 4), a gap that shows most in low-lit rooms.
Saybrook Sage reflects far more light (LRV 45 vs 4), opening up a space where Dock Blue encloses it.
At LRV 31 vs 4, Pale Green is decisively the brighter choice.
A 3-point LRV gap (7 vs 4) makes Pine Needle the marginally brighter of the two.
At LRV 24 vs 4, Cement grey is decisively the brighter choice.
At LRV 57 vs 4, Guilford Green is decisively the brighter choice.