#043D81
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.127 257), rgb(4, 61, 129).
Aa
White text reads best on this color (10.55:1).
About this color
#043D81 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.127 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #043D81 |
| RGB | rgb(4, 61, 129) |
| HSL | hsl(213, 94%, 26%) |
| OKLCH | oklch(37.1% 0.127 257) |
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 #043D81 | 10.55:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #043D81 | 1.98:1 | Fails | Lc 10.1 | Not readable |
| #043D81 text on white | 10.55:1 | AAA | Lc 93.8 | Preferred for body text |
| #043D81 text on black | 1.98:1 | Fails | Lc -8.7 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFD
oklch(88.5% 0.054 257.1)
-
Step 300
300
#99C3FE
oklch(80.9% 0.095 256.9)
-
Step 400
400
#5FA1FE
oklch(70.7% 0.153 257.2)
-
Step 500
500
#2B86FC
oklch(63.1% 0.195 257)
-
Step 600
600
#006EE3
oklch(55.7% 0.197 256.9)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900 (this color)
#043D81
oklch(37.1% 0.127 257)
-
Step 950
950
#08254D
oklch(26.9% 0.082 257.6)
#043D81 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) | #0E4483 | 0.022 |
| Deuteranopia (no green cones) | #003A80 | 0.009 |
| Tritanopia (no blue cones) | #004E59 | 0.096 |
| Achromatopsia (no color) | #3F3F3F | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043D81
#043D81
oklch(37.1% 0.127 257)
- #573900
#573900
oklch(37% 0.078 75.9)
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 #043D81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.069
- Marine #042E60 ΔE 0.070
- Dusk Blue #26538D ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.073
Use #043D81 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.