#043664
Closest named color: Marine Blue (#01386A). oklch(33% 0.095 252), rgb(4, 54, 100).
Aa
White text reads best on this color (12.23:1).
About this color
#043664 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.095 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.011 away. White text reads best on it, at 12.23:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.23:1 |
Values
| HEX | #043664 |
| RGB | rgb(4, 54, 100) |
| HSL | hsl(209, 92%, 20%) |
| OKLCH | oklch(33% 0.095 252) |
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 #043664 | 12.23:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #043664 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #043664 text on white | 12.23:1 | AAA | Lc 97.4 | Preferred for body text |
| #043664 text on black | 1.71:1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6AA5E5
oklch(70.8% 0.113 251.5)
-
Step 500
500
#3E8CDE
oklch(63.1% 0.146 252.2)
-
Step 600
600
#1474CC
oklch(55.5% 0.159 252.3)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#0A508F
oklch(42.8% 0.122 252)
-
Step 900
900 (this color)
#043664
oklch(33% 0.095 252)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#043664 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) | #1E3A66 | 0.025 |
| Deuteranopia (no green cones) | #0A3163 | 0.015 |
| Tritanopia (no blue cones) | #004148 | 0.069 |
| Achromatopsia (no color) | #353535 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043664
#043664
oklch(33% 0.095 252)
- #4B2E00
#4B2E00
oklch(32.9% 0.07 71.9)
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 #043664, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.011
- Marine #042E60 ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.028
- Midnight Green #073B4C ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.051
- Twilight Blue #0A437A ΔE 0.052
- Gunmetal #293241 ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.069
Use #043664 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.