Undercool vs H356
Where Undercool belongs to Sherwin-Williams's range, H356 is a Tikkurila color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. They have nearly identical light reflectance values (49 vs 51), so they'll read as similarly Medium in most lighting conditions. The ΔE 9.3 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Undercool vs H356 Simulated Comparison
5 simulated room previews — drag the slider on each to see Undercool on one side and H356 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 Undercool comparisons
See how Undercool stacks up against other well-photographed colors across different brands and tones.
