#003559
Closest named color: Prussian Blue (#1D3557). oklch(31.9% 0.082 245.8), rgb(0, 53, 89).
Aa
White text reads best on this color (12.70:1).
About this color
#003559 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.082 and its hue 246°. 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 12.70:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.65:1 |
| White text | 12.70:1 |
Values
| HEX | #003559 |
| RGB | rgb(0, 53, 89) |
| HSL | hsl(204, 100%, 17%) |
| OKLCH | oklch(31.9% 0.082 245.8) |
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 #003559 | 12.70:1 | AAA | Lc -101.7 | Preferred for body text |
| Black text on #003559 | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #003559 text on white | 12.70:1 | AAA | Lc 98.3 | Preferred for body text |
| #003559 text on black | 1.65:1 | 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
#EFF7FE
oklch(97.2% 0.013 244.3)
-
Step 100
100
#DBECFC
oklch(93.5% 0.028 246.5)
-
Step 200
200
#BDDEFB
oklch(88.6% 0.053 245)
-
Step 300
300
#8BC7FC
oklch(80.8% 0.098 246)
-
Step 400
400
#3BA8FA
oklch(70.8% 0.154 245.6)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C1
oklch(55.5% 0.143 246.2)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950 (this color)
#003559
oklch(31.9% 0.082 245.8)
#003559 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) | #23375A | 0.031 |
| Deuteranopia (no green cones) | #162F58 | 0.022 |
| Tritanopia (no blue cones) | #003E42 | 0.058 |
| Achromatopsia (no color) | #333333 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003559
#003559
oklch(31.9% 0.082 245.8)
- #4A2A00
#4A2A00
oklch(31.9% 0.071 66.7)
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 #003559, 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 #042E60 ΔE 0.027
- Marine Blue #01386A ΔE 0.031
- Midnight Green #073B4C ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.041
- Gunmetal #293241 ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.066
Use #003559 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.