Coastal Plain vs Obi Lilac
Both from Sherwin-Williams's palette. Coastal Plain reads as green-grey, while Obi Lilac reads as grey — two distinct hue families, not close cousins. They have nearly identical light reflectance values (37 vs 39), so they'll read as similarly Medium in most lighting conditions. Coastal Plain runs neutral while Obi Lilac is decidedly cool, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 21.8, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Coastal Plain vs Obi Lilac in Real Spaces
1 real room side by side. Seeing Coastal Plain and Obi Lilac in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. Obi Lilac brings more warmth to the space, while Coastal Plain keeps things cooler and crisper.
Color Details
Coastal Plain vs Obi Lilac Simulated Comparison
5 simulated room previews — drag the slider on each to see Coastal Plain on one side and Obi Lilac 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.