#042F4E
Closest named color: Marine (#042E60). oklch(29.6% 0.072 246), rgb(4, 47, 78).
Aa
White text reads best on this color (13.79:1).
About this color
#042F4E is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.072 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.033 away. White text reads best on it, at 13.79:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.52:1 |
| White text | 13.79:1 |
Values
| HEX | #042F4E |
| RGB | rgb(4, 47, 78) |
| HSL | hsl(205, 90%, 16%) |
| OKLCH | oklch(29.6% 0.072 246) |
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 #042F4E | 13.79:1 | AAA | Lc -103.2 | Preferred for body text |
| Black text on #042F4E | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #042F4E text on white | 13.79:1 | AAA | Lc 100.1 | Preferred for body text |
| #042F4E text on black | 1.52:1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DDECFA
oklch(93.6% 0.025 246.2)
-
Step 200
200
#C0DDF7
oklch(88.5% 0.047 245.4)
-
Step 300
300
#93C7F5
oklch(81% 0.085 245.8)
-
Step 400
400
#4FA7F0
oklch(70.6% 0.137 246.4)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C1
oklch(55.5% 0.143 246.2)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005387
oklch(42.8% 0.11 245.8)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950 (this color)
#042F4E
oklch(29.6% 0.072 246)
#042F4E 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) | #20304F | 0.027 |
| Deuteranopia (no green cones) | #152A4D | 0.019 |
| Tritanopia (no blue cones) | #00373A | 0.052 |
| Achromatopsia (no color) | #2D2D2D | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042F4E
#042F4E
oklch(29.6% 0.072 246)
- #422500
#422500
oklch(29.6% 0.065 66.8)
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 #042F4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Midnight Green #073B4C ΔE 0.043
- Oxford Blue #1B263B ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.046
- Gunmetal #293241 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Marine Blue #01386A ΔE 0.054
Use #042F4E 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.