#043A5A
Closest named color: Prussian Blue (#1D3557). oklch(33.4% 0.076 242.1), rgb(4, 58, 90).
Aa
White text reads best on this color (11.94:1).
About this color
#043A5A is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.076 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.022 away. White text reads best on it, at 11.94:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.75:1 |
| White text | 11.94:1 |
Values
| HEX | #043A5A |
| RGB | rgb(4, 58, 90) |
| HSL | hsl(202, 91%, 18%) |
| OKLCH | oklch(33.4% 0.076 242.1) |
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 #043A5A | 11.94:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #043A5A | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #043A5A text on white | 11.94:1 | AAA | Lc 96.9 | Preferred for body text |
| #043A5A 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A1C6E3
oklch(80.9% 0.057 242)
-
Step 400
400
#6BA8D5
oklch(70.8% 0.092 241.7)
-
Step 500
500
#3E91CA
oklch(63.1% 0.117 242)
-
Step 600
600
#117AB7
oklch(55.6% 0.128 242.3)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800
#085480
oklch(42.8% 0.098 242.3)
-
Step 900
900 (this color)
#043A5A
oklch(33.4% 0.076 242.1)
-
Step 950
950
#0E293C
oklch(27% 0.048 242.2)
#043A5A 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) | #2B3B5B | 0.036 |
| Deuteranopia (no green cones) | #1F3359 | 0.028 |
| Tritanopia (no blue cones) | #004245 | 0.052 |
| Achromatopsia (no color) | #373737 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043A5A
#043A5A
oklch(33.4% 0.076 242.1)
- #522C00
#522C00
oklch(33.5% 0.077 62.3)
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 #043A5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.022
- Midnight Green #073B4C ΔE 0.026
- Marine Blue #01386A ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.030
- Marine #042E60 ΔE 0.041
- Gunmetal #293241 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
- Charcoal #264653 ΔE 0.055
Use #043A5A 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.