#043553
Closest named color: Prussian Blue (#1D3557). oklch(31.6% 0.072 242.5), rgb(4, 53, 83).
Aa
White text reads best on this color (12.81:1).
About this color
#043553 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.072 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 12.81:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.63:1 |
| White text | 12.81:1 |
Values
| HEX | #043553 |
| RGB | rgb(4, 53, 83) |
| HSL | hsl(203, 91%, 17%) |
| OKLCH | oklch(31.6% 0.072 242.5) |
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 #043553 | 12.81:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #043553 | 1.63:1 | Fails | Lc 0.0 | Not readable |
| #043553 text on white | 12.81:1 | AAA | Lc 98.6 | Preferred for body text |
| #043553 text on black | 1.63:1 | 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 950.
-
Step 50
50
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECF9
oklch(93.5% 0.025 242.3)
-
Step 200
200
#BFDEF6
oklch(88.6% 0.047 241.4)
-
Step 300
300
#8FC8F4
oklch(81% 0.086 242.3)
-
Step 400
400
#45A9EE
oklch(70.6% 0.137 242.5)
-
Step 500
500
#0091DC
oklch(63% 0.151 242.6)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950 (this color)
#043553
oklch(31.6% 0.072 242.5)
#043553 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) | #273654 | 0.034 |
| Deuteranopia (no green cones) | #1C2F52 | 0.025 |
| Tritanopia (no blue cones) | #003C40 | 0.047 |
| Achromatopsia (no color) | #323232 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043553
#043553
oklch(31.6% 0.072 242.5)
- #4B2800
#4B2800
oklch(31.6% 0.072 62.7)
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 #043553, 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 0.027
- Dark Blue Grey #1F3B4D ΔE 0.035
- Marine #042E60 ΔE 0.035
- Marine Blue #01386A ΔE 0.041
- Gunmetal #293241 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.059
Use #043553 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.