#04517C
Closest named color: Deep Sea Blue (#015482). oklch(41.7% 0.097 242.1), rgb(4, 81, 124).
Aa
White text reads best on this color (8.49:1).
About this color
#04517C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.097 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.012 away. White text reads best on it, at 8.49:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.47:1 |
| White text | 8.49:1 |
Values
| HEX | #04517C |
| RGB | rgb(4, 81, 124) |
| HSL | hsl(202, 94%, 25%) |
| OKLCH | oklch(41.7% 0.097 242.1) |
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 #04517C | 8.49:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #04517C | 2.47:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #04517C text on white | 8.49:1 | AAA | Lc 88.7 | Fine for body text |
| #04517C text on black | 2.47:1 | Fails | Lc -13.5 | 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 800.
-
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
#6CA8D5
oklch(70.8% 0.091 242.1)
-
Step 500
500
#3F91C9
oklch(63.1% 0.116 241.8)
-
Step 600
600
#137AB6
oklch(55.6% 0.126 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800 (this color)
#04517C
oklch(41.7% 0.097 242.1)
-
Step 900
900
#154666
oklch(37.8% 0.075 241.7)
-
Step 950
950
#0E293C
oklch(27% 0.048 242.2)
#04517C 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) | #3C527E | 0.045 |
| Deuteranopia (no green cones) | #2C487B | 0.034 |
| Tritanopia (no blue cones) | #005C60 | 0.067 |
| Achromatopsia (no color) | #4D4D4D | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04517C
#04517C
oklch(41.7% 0.097 242.1)
- #703E00
#703E00
oklch(41.7% 0.096 62.2)
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 #04517C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.012
- Light Navy #155084 ΔE 0.017
- Dusk Blue #26538D ΔE 0.036
- Twilight Blue #0A437A ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.059
- Petrol #005F6A ΔE 0.060
Use #04517C 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.