#04183B
Closest named color: Navy Blue (#001146). oklch(21.8% 0.073 259.9), rgb(4, 24, 59).
Aa
White text reads best on this color (17.51:1).
About this color
#04183B is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.073 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.030 away. White text reads best on it, at 17.51:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.19:1 |
| White text | 17.51:1 |
Values
| HEX | #04183B |
| RGB | rgb(4, 24, 59) |
| HSL | hsl(218, 87%, 12%) |
| OKLCH | oklch(21.8% 0.073 259.9) |
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 #04183B | 17.51:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #04183B | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #04183B text on white | 17.51:1 | AAA | Lc 104.1 | Preferred for body text |
| #04183B text on black | 1.19:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6CA0F6
oklch(70.7% 0.138 260)
-
Step 500
500
#4486F2
oklch(63.2% 0.176 259.8)
-
Step 600
600
#236CE1
oklch(55.6% 0.192 259.9)
-
Step 700
700
#1659C3
oklch(49% 0.178 260)
-
Step 800
800
#154A9E
oklch(42.8% 0.148 259.8)
-
Step 900
900
#183F7D
oklch(37.7% 0.114 259.5)
-
Step 950
950 (this color)
#04183B
oklch(21.8% 0.073 259.9)
#04183B 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) | #031C3C | 0.013 |
| Deuteranopia (no green cones) | #00173A | 0.007 |
| Tritanopia (no blue cones) | #002126 | 0.058 |
| Achromatopsia (no color) | #191919 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04183B
#04183B
oklch(21.8% 0.073 259.9)
- #251700
#251700
oklch(21.7% 0.045 79.1)
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 #04183B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.030
- Rich Black #0D1B2A ΔE 0.038
- Night Blue #040348 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.060
- Dark #1B2431 ΔE 0.061
- Dark Navy #000435 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.068
- Rich Navy #001219 ΔE 0.071
Use #04183B 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.