Impromptu vs L366
Impromptu (Sherwin-Williams) and L366 (Tikkurila) come from different manufacturers. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. The 7-point LRV gap — 23 for Impromptu vs 15 for L366 — means Impromptu will open up a space more effectively. A ΔE of 17.9 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Impromptu vs L366 Simulated Comparison
5 simulated room previews — drag the slider on each to see Impromptu on one side and L366 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 Impromptu comparisons
See how Impromptu stacks up against other well-photographed colors across different brands and tones.
