Nautilus vs Undercool

Both are Sherwin-Williams colors. These are both blues, so the question isn't which hue to choose — it's where within blue to land. At LRV 49 vs 42, Undercool will read as the brighter of the two — a 7-point gap that matters most in north-facing or low-light rooms. They share a cool quality — useful to know if you're layering them in the same space. At ΔE 9.7, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.