#043B67
Closest named color: Marine Blue (#01386A). oklch(34.6% 0.093 249.4), rgb(4, 59, 103).
Aa
White text reads best on this color (11.49:1).
About this color
#043B67 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.093 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.012 away. White text reads best on it, at 11.49:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.49:1 |
Values
| HEX | #043B67 |
| RGB | rgb(4, 59, 103) |
| HSL | hsl(207, 93%, 21%) |
| OKLCH | oklch(34.6% 0.093 249.4) |
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 #043B67 | 11.49:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #043B67 | 1.82:1 | Fails | Lc 7.9 | Not readable |
| #043B67 text on white | 11.49:1 | AAA | Lc 96.0 | Preferred for body text |
| #043B67 text on black | 1.82:1 | 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 900.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9EC5EC
oklch(80.9% 0.069 248.7)
-
Step 400
400
#67A6E3
oklch(70.8% 0.111 248.9)
-
Step 500
500
#398EDB
oklch(63.2% 0.142 249.3)
-
Step 600
600
#0176C9
oklch(55.6% 0.155 249.5)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900 (this color)
#043B67
oklch(34.6% 0.093 249.4)
-
Step 950
950
#0C2842
oklch(27.1% 0.059 249.5)
#043B67 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) | #253E69 | 0.029 |
| Deuteranopia (no green cones) | #143566 | 0.019 |
| Tritanopia (no blue cones) | #00464C | 0.067 |
| Achromatopsia (no color) | #393939 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043B67
#043B67
oklch(34.6% 0.093 249.4)
- #523100
#523100
oklch(34.6% 0.075 69.4)
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 #043B67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.039
- Marine #042E60 ΔE 0.041
- Midnight Green #073B4C ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.056
- Charcoal #264653 ΔE 0.063
Use #043B67 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.