Apollo Blue vs Portsmouth
Where Apollo Blue belongs to Benjamin Moore's range, Portsmouth is a Sherwin-Williams color. These are both blue-greys, so the question isn't which hue to choose — it's where within blue-grey to land. They have nearly identical light reflectance values (24 vs 22), so they'll read as similarly Dark in most lighting conditions. Apollo Blue runs blue while Portsmouth is decidedly neutral, which means they'll respond very differently to warm vs cool light sources. At ΔE 0.6, these are close — the kind of difference that matters when choosing between them, but doesn't read strongly in a finished room. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Apollo Blue vs Portsmouth Simulated Comparison
5 simulated room previews — drag the slider on each to see Apollo Blue on one side and Portsmouth 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 Apollo Blue comparisons
See how Apollo Blue stacks up against other well-photographed colors across different brands and tones.
