#043A5C
Closest named color: Prussian Blue (#1D3557). oklch(33.5% 0.079 243.6), rgb(4, 58, 92).
Aa
White text reads best on this color (11.89:1).
About this color
#043A5C is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.079 and its hue 244°. 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 11.89:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.89:1 |
Values
| HEX | #043A5C |
| RGB | rgb(4, 58, 92) |
| HSL | hsl(203, 92%, 19%) |
| OKLCH | oklch(33.5% 0.079 243.6) |
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 #043A5C | 11.89:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #043A5C | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #043A5C text on white | 11.89:1 | AAA | Lc 96.8 | Preferred for body text |
| #043A5C text on black | 1.76:1 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#A0C6E5
oklch(81% 0.06 243.2)
-
Step 400
400
#6BA7D7
oklch(70.6% 0.094 243.8)
-
Step 500
500
#3E90CD
oklch(63% 0.121 244.1)
-
Step 600
600
#0F79BA
oklch(55.5% 0.132 244)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#075382
oklch(42.6% 0.102 244.1)
-
Step 900
900 (this color)
#043A5C
oklch(33.5% 0.079 243.6)
-
Step 950
950
#0E293D
oklch(27.1% 0.05 243.6)
#043A5C 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) | #2A3B5D | 0.035 |
| Deuteranopia (no green cones) | #1D345B | 0.024 |
| Tritanopia (no blue cones) | #004246 | 0.054 |
| Achromatopsia (no color) | #373737 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043A5C
#043A5C
oklch(33.5% 0.079 243.6)
- #512D00
#512D00
oklch(33.6% 0.076 64.6)
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 #043A5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.022
- Marine Blue #01386A ΔE 0.027
- Midnight Green #073B4C ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.033
- Marine #042E60 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.054
- Gunmetal #293241 ΔE 0.055
- Charcoal #264653 ΔE 0.056
Use #043A5C 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.