#042F58
Closest named color: Marine (#042E60). oklch(30.3% 0.086 252.2), rgb(4, 47, 88).
Aa
White text reads best on this color (13.52:1).
About this color
#042F58 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.086 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.015 away. White text reads best on it, at 13.52:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.55:1 |
| White text | 13.52:1 |
Values
| HEX | #042F58 |
| RGB | rgb(4, 47, 88) |
| HSL | hsl(209, 91%, 18%) |
| OKLCH | oklch(30.3% 0.086 252.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #042F58 | 13.52:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #042F58 | 1.55:1 | Fails | Lc 0.0 | Not readable |
| #042F58 text on white | 13.52:1 | AAA | Lc 99.6 | Preferred for body text |
| #042F58 text on black | 1.55:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 950.
-
Step 50
50
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DCECFE
oklch(93.7% 0.03 251.3)
-
Step 200
200
#BFDCFE
oklch(88.4% 0.056 252.5)
-
Step 300
300
#92C5FF
oklch(80.9% 0.099 252.2)
-
Step 400
400
#4EA4FF
oklch(70.7% 0.157 252.1)
-
Step 500
500
#008AF7
oklch(63.1% 0.19 252.2)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#00427B
oklch(37.7% 0.113 252.1)
-
Step 950
950 (this color)
#042F58
oklch(30.3% 0.086 252.2)
#042F58 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #1A325A | 0.022 |
| Deuteranopia (no green cones) | #092B57 | 0.012 |
| Tritanopia (no blue cones) | #00393F | 0.063 |
| Achromatopsia (no color) | #2E2E2E | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042F58
#042F58
oklch(30.3% 0.086 252.2)
- #422800
#422800
oklch(30.2% 0.065 72)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #042F58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.015
- Prussian Blue #1D3557 ΔE 0.031
- Marine Blue #01386A ΔE 0.040
- Midnight Green #073B4C ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.055
- Oxford Blue #1B263B ΔE 0.056
- Gunmetal #293241 ΔE 0.058
Use #042F58 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.