#043571
Closest named color: Marine Blue (#01386A). oklch(33.8% 0.115 257), rgb(4, 53, 113).
Aa
White text reads best on this color (11.98:1).
About this color
#043571 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.115 and its hue 257°. 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 11.98:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.98:1 |
Values
| HEX | #043571 |
| RGB | rgb(4, 53, 113) |
| HSL | hsl(213, 93%, 23%) |
| OKLCH | oklch(33.8% 0.115 257) |
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 #043571 | 11.98:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #043571 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #043571 text on white | 11.98:1 | AAA | Lc 96.8 | Preferred for body text |
| #043571 text on black | 1.75:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9DC3F8
oklch(80.9% 0.086 256.8)
-
Step 400
400
#66A2F5
oklch(70.7% 0.137 256.8)
-
Step 500
500
#3988F1
oklch(63.2% 0.175 256.8)
-
Step 600
600
#0C6EE0
oklch(55.5% 0.192 257.1)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#054B9D
oklch(42.6% 0.148 257.1)
-
Step 900
900 (this color)
#043571
oklch(33.8% 0.115 257)
-
Step 950
950
#0C2649
oklch(27% 0.072 256.9)
#043571 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) | #0C3C73 | 0.022 |
| Deuteranopia (no green cones) | #003270 | 0.010 |
| Tritanopia (no blue cones) | #00444D | 0.087 |
| Achromatopsia (no color) | #373737 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043571
#043571
oklch(33.8% 0.115 257)
- #4C3200
#4C3200
oklch(33.9% 0.071 77.1)
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 #043571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Marine #042E60 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.048
- Midnight Blue #191970 ΔE 0.068
- Midnight Green #073B4C ΔE 0.072
- Dark Blue Grey #1F3B4D ΔE 0.072
- Cobalt #1E488F ΔE 0.077
Use #043571 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.