#043F82
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.126 256.3), rgb(4, 63, 130).
Aa
White text reads best on this color (10.30:1).
About this color
#043F82 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.126 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.019 away. White text reads best on it, at 10.30:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.30:1 |
Values
| HEX | #043F82 |
| RGB | rgb(4, 63, 130) |
| HSL | hsl(212, 94%, 26%) |
| OKLCH | oklch(37.6% 0.126 256.3) |
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 #043F82 | 10.30:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #043F82 | 2.03:1 | Fails | Lc 10.6 | Not readable |
| #043F82 text on white | 10.30:1 | AAA | Lc 93.3 | Preferred for body text |
| #043F82 text on black | 2.03:1 | Fails | Lc -9.2 | 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
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#99C3FD
oklch(80.8% 0.094 256.6)
-
Step 400
400
#5EA2FD
oklch(70.8% 0.151 256.3)
-
Step 500
500
#2887FB
oklch(63.2% 0.193 256.3)
-
Step 600
600
#006FE0
oklch(55.6% 0.192 256.3)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900 (this color)
#043F82
oklch(37.6% 0.126 256.3)
-
Step 950
950
#07264C
oklch(27.1% 0.079 255.8)
#043F82 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) | #144684 | 0.024 |
| Deuteranopia (no green cones) | #003B81 | 0.012 |
| Tritanopia (no blue cones) | #004F5A | 0.093 |
| Achromatopsia (no color) | #404040 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043F82
#043F82
oklch(37.6% 0.126 256.3)
- #593B00
#593B00
oklch(37.8% 0.079 76.7)
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 #043F82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.019
- Cobalt #1E488F ΔE 0.039
- Marine Blue #01386A ΔE 0.045
- Light Navy #155084 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.063
- Dusk Blue #26538D ΔE 0.067
- Sapphire #2138AB ΔE 0.073
- Marine #042E60 ΔE 0.074
Use #043F82 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.