Atlantic Shoreline vs Undersea
Both from Behr's palette. Both sit in the blue-grey family, which is useful context if you're narrowing within a single hue direction. Atlantic Shoreline (LRV 21) reflects noticeably more light than Undersea (LRV 9), a difference of 11 points that becomes especially apparent in rooms with limited natural light. Both lean blue, so they'll behave similarly in mixed or changing light conditions. With a ΔE of 16.4, 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.
Atlantic Shoreline vs Undersea in Real Spaces
1 real room side by side. Seeing Atlantic Shoreline and Undersea in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Atlantic Shoreline reflects noticeably more light off the walls, making the space read more open than Undersea.
Color Details
Atlantic Shoreline vs Undersea Simulated Comparison
5 simulated room previews — drag the slider on each to see Atlantic Shoreline on one side and Undersea 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 Atlantic Shoreline comparisons
See how Atlantic Shoreline stacks up against other well-photographed colors across different brands and tones.
At LRV 69 vs 21, Ammonite is decisively the brighter choice.
White Dove reflects far more light (LRV 83 vs 21), opening up a space where Atlantic Shoreline encloses it.
Atlantic Shoreline reflects far more light (LRV 21 vs 6), opening up a space where Iron Ore encloses it.
At LRV 52 vs 21, Purbeck Stone is decisively the brighter choice.
A 10-point LRV gap (30 vs 21) makes Evergreen Fog the marginally brighter of the two.
Mizzle reflects far more light (LRV 52 vs 21), opening up a space where Atlantic Shoreline encloses it.
At LRV 60 vs 21, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 21), opening up a space where Atlantic Shoreline encloses it.
Denim Drift reads slightly lighter (LRV 27 vs 21), a gap that shows most in low-lit rooms.
At LRV 43 vs 21, French Gray is decisively the brighter choice.
At LRV 21 vs 4, Atlantic Shoreline is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 21), opening up a space where Atlantic Shoreline encloses it.
Atlantic Shoreline reads slightly lighter (LRV 21 vs 13), a gap that shows most in low-lit rooms.
Hardwick White reflects far more light (LRV 44 vs 21), opening up a space where Atlantic Shoreline encloses it.
At LRV 84 vs 21, Pure White is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 21 vs 21), so neither reads brighter in a room.
Balboa Mist reflects far more light (LRV 66 vs 21), opening up a space where Atlantic Shoreline encloses it.
Shoji White reflects far more light (LRV 74 vs 21), opening up a space where Atlantic Shoreline encloses it.
Snowbound reflects far more light (LRV 83 vs 21), opening up a space where Atlantic Shoreline encloses it.
At LRV 51 vs 21, Pigeon is decisively the brighter choice.
Atlantic Shoreline reads slightly lighter (LRV 21 vs 12), a gap that shows most in low-lit rooms.
Atlantic Shoreline reflects far more light (LRV 21 vs 8), opening up a space where Duck Green encloses it.
Skimming Stone reflects far more light (LRV 68 vs 21), opening up a space where Atlantic Shoreline encloses it.
At LRV 41 vs 21, Dix Blue is decisively the brighter choice.
Atlantic Shoreline reads slightly lighter (LRV 21 vs 12), a gap that shows most in low-lit rooms.
Saybrook Sage reflects far more light (LRV 45 vs 21), opening up a space where Atlantic Shoreline encloses it.
A 11-point LRV gap (31 vs 21) makes Pale Green the marginally brighter of the two.