Sky Blue vs Undercool
Where Sky Blue belongs to Little Greene's range, Undercool is a Sherwin-Williams color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. Sky Blue (LRV 61) reflects noticeably more light than Undercool (LRV 49), a difference of 12 points that becomes especially apparent in rooms with limited natural light. Sky Blue runs blue while Undercool is decidedly cool, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 14.7, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Sky Blue vs Undercool Simulated Comparison
5 simulated room previews — drag the slider on each to see Sky Blue on one side and Undercool 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 Sky Blue comparisons
See how Sky Blue stacks up against other well-photographed colors across different brands and tones.
