Comparison

Outerspace vs Thunderstorm

Sherwin-Williams SW 6251 and Vista Paint 0514, ΔE 1.73 apart

Sherwin-Williams Outerspace SW 6251 on a wall, hex #586168
Outerspace Sherwin-Williams SW 6251
Vista Paint Thunderstorm 0514 on a wall, hex #5D636B
Thunderstorm Vista Paint 0514
Zeytin’s verdict · ΔE 1.73Twins, almost. Only daylight on a big wall tells them apart.

Sherwin-Williams Outerspace (SW 6251) and Vista Paint Thunderstorm (0514) measure a delta-E of 1.73 apart. They sit within 1.4 LRV points of each other, so neither will look brighter than the other on the same wall. Both carry a similar amount of color, at chroma 5.5 and 5.3. The difference is measurable but subtle. It shows on a large wall in strong daylight and disappears under lamplight. If you need the Outerspace depth in Vista Paint's line, start from its LRV of 11.6 rather than matching by name.

Is Sherwin-Williams Outerspace the same color as Vista Paint Thunderstorm?

Not quite, but close - Sherwin-Williams Outerspace and Vista Paint Thunderstorm are delta-E 1.73 apart, close enough that most rooms would not show the difference.

What is the delta-E between Sherwin-Williams Outerspace and Vista Paint Thunderstorm?

The measured color distance between Sherwin-Williams Outerspace and Vista Paint Thunderstorm is delta-E 1.73.

Which is lighter, Sherwin-Williams Outerspace or Vista Paint Thunderstorm?

Vista Paint Thunderstorm is lighter than Sherwin-Williams Outerspace by 1.4 points of light reflectance (LRV).

CLOSEST PAIRΔE 1.73 Outerspace and Thunderstorm
LIGHTESTThunderstorm LRV 13.0
DARKESTOuterspace LRV 11.6
SPREAD1.4LRV points

Side by side

measured values
Outerspace Thunderstorm
Brand Sherwin-Williams Vista Paint
Code SW 6251 0514
Hex #586168 #5D636B
Light reflectance 11.6 13.0
Undertone blue cast blue cast
Chroma 5.5 5.3
Hue angle 250.3° 264.5°
Color family black gray

Each on its own

full detail