#043C68
Closest named color: Marine Blue (#01386A). oklch(34.9% 0.093 249.1), rgb(4, 60, 104).
Aa
White text reads best on this color (11.34:1).
About this color
#043C68 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 0.014 away. White text reads best on it, at 11.34:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.34:1 |
Values
| HEX | #043C68 |
| RGB | rgb(4, 60, 104) |
| HSL | hsl(206, 93%, 21%) |
| OKLCH | oklch(34.9% 0.093 249.1) |
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 #043C68 | 11.34:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #043C68 | 1.85:1 | Fails | Lc 8.2 | Not readable |
| #043C68 text on white | 11.34:1 | AAA | Lc 95.7 | Preferred for body text |
| #043C68 text on black | 1.85:1 | 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
#378EDB
oklch(63.1% 0.142 248.9)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900 (this color)
#043C68
oklch(34.9% 0.093 249.1)
-
Step 950
950
#0B2842
oklch(27% 0.059 248.9)
#043C68 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) | #263F6A | 0.030 |
| Deuteranopia (no green cones) | #163667 | 0.019 |
| Tritanopia (no blue cones) | #00474D | 0.067 |
| Achromatopsia (no color) | #3A3A3A | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043C68
#043C68
oklch(34.9% 0.093 249.1)
- #533200
#533200
oklch(34.9% 0.076 69.9)
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 #043C68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.014
- Prussian Blue #1D3557 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.036
- Marine #042E60 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.049
- Midnight Green #073B4C ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.054
- Charcoal #264653 ΔE 0.061
Use #043C68 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.