Ammonite vs Rhythmic Blue
Ammonite (Farrow & Ball) and Rhythmic Blue (Sherwin-Williams) come from different manufacturers. Hue-wise, Ammonite belongs to the beige-greige family and Rhythmic Blue to the blue family. Their light reflectance values are nearly the same — 69 vs 69 — so neither will read significantly brighter or darker than the other. Where Ammonite leans warm, Rhythmic Blue reads cool — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 12.1 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Ammonite vs Rhythmic Blue in Real Spaces
2 real rooms side by side. Seeing Ammonite and Rhythmic Blue in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Rhythmic Blue reads more restrained here, while Ammonite adds a sense of enclosure and warmth.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. Rhythmic Blue reads more restrained here, while Ammonite adds a sense of enclosure and warmth.
Color Details
Ammonite vs Rhythmic Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Ammonite on one side and Rhythmic Blue 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 Ammonite comparisons
See how Ammonite stacks up against other well-photographed colors across different brands and tones.
