#043D6C
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.097 250.2), rgb(4, 61, 108).
Aa
White text reads best on this color (11.11:1).
About this color
#043D6C is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.097 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.11:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #043D6C |
| RGB | rgb(4, 61, 108) |
| HSL | hsl(207, 93%, 22%) |
| OKLCH | oklch(35.4% 0.097 250.2) |
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 #043D6C | 11.11:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #043D6C | 1.88:1 | Fails | Lc 8.7 | Not readable |
| #043D6C text on white | 11.11:1 | AAA | Lc 95.2 | Preferred for body text |
| #043D6C text on black | 1.88:1 | Fails | Lc -7.5 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9DC5EF
oklch(80.9% 0.073 250)
-
Step 400
400
#65A5E7
oklch(70.6% 0.118 250.5)
-
Step 500
500
#358DE0
oklch(63.1% 0.15 250.5)
-
Step 600
600
#0075CB
oklch(55.5% 0.159 250.4)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900 (this color)
#043D6C
oklch(35.4% 0.097 250.2)
-
Step 950
950
#0B2843
oklch(27.1% 0.061 249.8)
#043D6C 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) | #25406E | 0.028 |
| Deuteranopia (no green cones) | #13376B | 0.018 |
| Tritanopia (no blue cones) | #00484F | 0.070 |
| Achromatopsia (no color) | #3C3C3C | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043D6C
#043D6C
oklch(35.4% 0.097 250.2)
- #553300
#553300
oklch(35.4% 0.077 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 #043D6C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Twilight Blue #0A437A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.041
- Marine #042E60 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
- Charcoal #264653 ΔE 0.064
Use #043D6C 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.