Pewter Cast vs Porpoise
Both from Sherwin-Williams's palette. Hue-wise, Pewter Cast belongs to the grey family and Porpoise to the greige-grey family. Pewter Cast (LRV 31) reflects noticeably more light than Porpoise (LRV 13), a difference of 18 points that becomes especially apparent in rooms with limited natural light. Pewter Cast runs neutral while Porpoise is decidedly warm, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 20.5, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Pewter Cast vs Porpoise in Real Spaces
3 real rooms side by side. Seeing Pewter Cast and Porpoise in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Pewter Cast reflects noticeably more light off the walls, making the space read more open than Porpoise.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. Pewter Cast reflects noticeably more light off the walls, making the space read more open than Porpoise.
Front Door
A front door is a focal point — small color differences read clearly at this concentrated scale. The LRV gap is large enough that Pewter Cast will make the room feel meaningfully brighter than Porpoise would.
Color Details
Pewter Cast vs Porpoise Simulated Comparison
5 simulated room previews — drag the slider on each to see Pewter Cast on one side and Porpoise 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 Pewter Cast comparisons
See how Pewter Cast stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 31), opening up a space where Pewter Cast encloses it.
At LRV 69 vs 31, Ammonite is decisively the brighter choice.
Pewter Cast reflects far more light (LRV 31 vs 6), opening up a space where Iron Ore encloses it.
At LRV 52 vs 31, Purbeck Stone is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 31 vs 30), so neither reads brighter in a room.
Mizzle reflects far more light (LRV 52 vs 31), opening up a space where Pewter Cast encloses it.
At LRV 60 vs 31, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 31), opening up a space where Pewter Cast encloses it.
Pewter Cast reads slightly lighter (LRV 31 vs 27), a gap that shows most in low-lit rooms.
A 12-point LRV gap (43 vs 31) makes French Gray the marginally brighter of the two.
At LRV 31 vs 4, Pewter Cast is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 31), opening up a space where Pewter Cast encloses it.
Pewter Cast reflects far more light (LRV 31 vs 13), opening up a space where Bancha encloses it.
Hardwick White reflects far more light (LRV 44 vs 31), opening up a space where Pewter Cast encloses it.
At LRV 84 vs 31, Pure White is decisively the brighter choice.
A 10-point LRV gap (31 vs 21) makes Pewter Cast the marginally brighter of the two.
Balboa Mist reflects far more light (LRV 66 vs 31), opening up a space where Pewter Cast encloses it.
Shoji White reflects far more light (LRV 74 vs 31), opening up a space where Pewter Cast encloses it.
Snowbound reflects far more light (LRV 83 vs 31), opening up a space where Pewter Cast encloses it.
Pewter Cast reflects far more light (LRV 31 vs 12), opening up a space where Pewter Green encloses it.
Skimming Stone reflects far more light (LRV 68 vs 31), opening up a space where Pewter Cast encloses it.
A 10-point LRV gap (41 vs 31) makes Dix Blue the marginally brighter of the two.
At LRV 68 vs 31, Calamine is decisively the brighter choice.
A 7-point LRV gap (31 vs 25) makes Pewter Cast the marginally brighter of the two.
Pewter Cast reflects far more light (LRV 31 vs 12), opening up a space where Vintage Vogue encloses it.
Saybrook Sage reflects far more light (LRV 45 vs 31), opening up a space where Pewter Cast encloses it.
Their light reflectance is nearly identical (LRV 31 vs 31), so neither reads brighter in a room.
At LRV 31 vs 7, Pewter Cast is decisively the brighter choice.
A 7-point LRV gap (31 vs 24) makes Pewter Cast the marginally brighter of the two.
At LRV 57 vs 31, Guilford Green is decisively the brighter choice.