#04183E
Closest named color: Navy Blue (#001146). oklch(22% 0.078 260.8), rgb(4, 24, 62).
Aa
White text reads best on this color (17.42:1).
About this color
#04183E is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.078 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.027 away. White text reads best on it, at 17.42:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.20:1 |
| White text | 17.42:1 |
Values
| HEX | #04183E |
| RGB | rgb(4, 24, 62) |
| HSL | hsl(219, 88%, 13%) |
| OKLCH | oklch(22% 0.078 260.8) |
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 #04183E | 17.42:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #04183E | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #04183E text on white | 17.42:1 | AAA | Lc 104.0 | Preferred for body text |
| #04183E text on black | 1.20:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC2FD
oklch(81% 0.092 260.7)
-
Step 400
400
#6A9FFC
oklch(70.7% 0.148 261)
-
Step 500
500
#4184F9
oklch(63.1% 0.188 260.7)
-
Step 600
600
#216AE8
oklch(55.7% 0.204 260.8)
-
Step 700
700
#1457CA
oklch(49.1% 0.19 260.9)
-
Step 800
800
#1348A3
oklch(42.7% 0.157 260.7)
-
Step 900
900
#173E81
oklch(37.8% 0.122 260.5)
-
Step 950
950 (this color)
#04183E
oklch(22% 0.078 260.8)
#04183E 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) | #001D3F | 0.016 |
| Deuteranopia (no green cones) | #00173D | 0.007 |
| Tritanopia (no blue cones) | #002128 | 0.058 |
| Achromatopsia (no color) | #1A1A1A | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04183E
#04183E
oklch(22% 0.078 260.8)
- #251800
#251800
oklch(22% 0.045 81.8)
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 #04183E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.027
- Rich Black #0D1B2A ΔE 0.043
- Night Blue #040348 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.060
- Dark #1B2431 ΔE 0.063
- Dark Navy #000435 ΔE 0.063
- Dark Indigo #1F0954 ΔE 0.064
- Very Dark Blue #000133 ΔE 0.075
Use #04183E 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.