#043F67
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.088 245.9), rgb(4, 63, 103).
Aa
White text reads best on this color (10.98:1).
About this color
#043F67 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.088 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.024 away. White text reads best on it, at 10.98:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.91:1 |
| White text | 10.98:1 |
Values
| HEX | #043F67 |
| RGB | rgb(4, 63, 103) |
| HSL | hsl(204, 93%, 21%) |
| OKLCH | oklch(35.6% 0.088 245.9) |
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 #043F67 | 10.98:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #043F67 | 1.91:1 | Fails | Lc 9.0 | Not readable |
| #043F67 text on white | 10.98:1 | AAA | Lc 94.9 | Preferred for body text |
| #043F67 text on black | 1.91:1 | Fails | Lc -7.7 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9EC6E9
oklch(81% 0.065 245.1)
-
Step 400
400
#66A7DF
oklch(70.7% 0.106 246)
-
Step 500
500
#3590D6
oklch(63.2% 0.135 245.8)
-
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 (this color)
#043F67
oklch(35.6% 0.088 245.9)
-
Step 950
950
#0B2940
oklch(27.2% 0.055 245.2)
#043F67 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) | #2C4169 | 0.035 |
| Deuteranopia (no green cones) | #1D3866 | 0.025 |
| Tritanopia (no blue cones) | #00494E | 0.062 |
| Achromatopsia (no color) | #3C3C3C | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043F67
#043F67
oklch(35.6% 0.088 245.9)
- #583200
#583200
oklch(35.7% 0.08 65.5)
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 #043F67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.024
- Twilight Blue #0A437A ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.047
- Charcoal #264653 ΔE 0.053
- Marine #042E60 ΔE 0.053
Use #043F67 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.