#043D6D
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.099 250.7), rgb(4, 61, 109).
Aa
White text reads best on this color (11.09:1).
About this color
#043D6D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.099 and its hue 251°. 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 11.09:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #043D6D |
| RGB | rgb(4, 61, 109) |
| HSL | hsl(207, 93%, 22%) |
| OKLCH | oklch(35.5% 0.099 250.7) |
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 #043D6D | 11.09:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #043D6D | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #043D6D text on white | 11.09:1 | AAA | Lc 95.1 | Preferred for body text |
| #043D6D text on black | 1.89:1 | 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
#65A5E8
oklch(70.7% 0.119 250.9)
-
Step 500
500
#348DE1
oklch(63.1% 0.152 250.6)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900 (this color)
#043D6D
oklch(35.5% 0.099 250.7)
-
Step 950
950
#0B2844
oklch(27.2% 0.062 250.6)
#043D6D 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) | #24406F | 0.027 |
| Deuteranopia (no green cones) | #11386C | 0.015 |
| Tritanopia (no blue cones) | #00494F | 0.073 |
| Achromatopsia (no color) | #3C3C3C | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043D6D
#043D6D
oklch(35.5% 0.099 250.7)
- #553400
#553400
oklch(35.7% 0.077 70.8)
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 #043D6D, 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 0.028
- Prussian Blue #1D3557 ΔE 0.043
- Marine #042E60 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.057
- Midnight Green #073B4C ΔE 0.058
- Charcoal #264653 ΔE 0.065
Use #043D6D 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.