Behr Neptune Blue#39729C · LRV 15
Neptune Blue reads as a blue / cool — dark — high drama, needs strong daylight or warm bulbs. The notes below cover the spec, what Behr 570D-6 actually looks like under different light, and the closest matches at competing US brands.
Color spec
| Brand | Behr |
| Name | Neptune Blue |
| SKU | 570D-6 |
| Hex | #39729C |
| RGB | 57, 114, 156 |
| HSL | 205°, 46%, 42% |
| LRV | 15 |
| Undertone | blue / cool |
| Family | Blue |
About Behr Neptune Blue
With an LRV of 15, Neptune Blue is a deep, dramatic shade. It soaks up light in north-facing rooms and looks richest where strong daylight hits it. Its blue undertone is the part to watch: it gets picked up by whatever sits next to it, so test it against your trim, floor and the room's main light before committing. Warm artificial light softens it; cool LED can make it look flat, so match your bulbs to the mood you want.
Neptune Blue works best as a feature — a single wall, built-ins, a study or dining room — rather than wrapping a whole bright space. Blues calm a room, which makes them popular in bedrooms, bathrooms and home offices.
Kompozit alternative
The closest hex in the Kompozit deck, ranked by ΔE2000 (perceptual color difference). ΔE under 2 is indistinguishable to most eyes; under 5 is a very close visual match.
Closest matches at every US brand
9 brands · top 5 each5 closest matches per brand by ΔE2000, computed against each brand's full deck. Tap any swatch for its full single-color spec; tap the brand title to browse all blue from that brand.
Benjamin Moore
Clare
Dunn-Edwards
PPG / Glidden
Sherwin-Williams
Valspar
Magnolia Home
Backdrop
Similar Behr colors
closest in the Behr deckThe nearest shades to Neptune Blue within Behr's own range, ranked by perceptual color distance — useful when you want the same look a touch lighter, darker, or warmer.
Coordinated palette
Generated by hue-rotating #39729C in HSL space. Pair Neptune Blue with one accent and one neutral — the swatches below are starting points, not final picks.
Accessibility (WCAG contrast)
WCAG 2.1: AA = 4.5:1 normal text · AA Large = 3:1 large text · AAA = 7:1 normal text.