#04559B
Closest named color: Dusk Blue (#26538D). oklch(44.8% 0.133 252.3), rgb(4, 85, 155).
Aa
White text reads best on this color (7.55:1).
About this color
#04559B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.133 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.027 away. White text reads best on it, at 7.55:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.77:1 |
| White text | 7.55:1 |
Values
| HEX | #04559B |
| RGB | rgb(4, 85, 155) |
| HSL | hsl(208, 95%, 31%) |
| OKLCH | oklch(44.8% 0.133 252.3) |
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 #04559B | 7.55:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #04559B | 2.77:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #04559B text on white | 7.55:1 | AAA | Lc 85.6 | Fine for body text |
| #04559B text on black | 2.77:1 | Fails | Lc -16.4 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9DC4F2
oklch(80.8% 0.078 252.9)
-
Step 400
400
#64A4EC
oklch(70.6% 0.125 252.5)
-
Step 500
500
#348CE6
oklch(63.2% 0.159 252.3)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800 (this color)
#04559B
oklch(44.8% 0.133 252.3)
-
Step 900
900
#0D4276
oklch(37.6% 0.103 252.5)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#04559B 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) | #2F5B9E | 0.034 |
| Deuteranopia (no green cones) | #0D4E9A | 0.019 |
| Tritanopia (no blue cones) | #006670 | 0.098 |
| Achromatopsia (no color) | #545454 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04559B
#04559B
oklch(44.8% 0.133 252.3)
- #744A00
#744A00
oklch(44.6% 0.095 72.3)
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 #04559B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.027
- Light Navy #155084 ΔE 0.038
- Cobalt #1E488F ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.047
- Peacock Blue #016795 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.065
Use #04559B 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.