#04182E
Closest named color: Rich Black (#0D1B2A). oklch(20.6% 0.051 252.1), rgb(4, 24, 46).
Aa
White text reads best on this color (17.86:1).
About this color
#04182E is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.051 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.020 away. White text reads best on it, at 17.86:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.86:1 |
Values
| HEX | #04182E |
| RGB | rgb(4, 24, 46) |
| HSL | hsl(211, 84%, 10%) |
| OKLCH | oklch(20.6% 0.051 252.1) |
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 #04182E | 17.86:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #04182E | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #04182E text on white | 17.86:1 | AAA | Lc 104.5 | Preferred for body text |
| #04182E text on black | 1.17:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBEF
oklch(88.5% 0.033 252.5)
-
Step 300
300
#A5C4E8
oklch(81% 0.061 252.4)
-
Step 400
400
#73A4DC
oklch(70.6% 0.098 252.5)
-
Step 500
500
#4D8DD2
oklch(63.2% 0.124 251.9)
-
Step 600
600
#2D75BF
oklch(55.5% 0.135 252.1)
-
Step 700
700
#1F62A5
oklch(49% 0.126 252.1)
-
Step 800
800
#1C5086
oklch(42.6% 0.105 252.4)
-
Step 900
900
#1E436B
oklch(37.7% 0.081 252.3)
-
Step 950
950 (this color)
#04182E
oklch(20.6% 0.051 252.1)
#04182E 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) | #0D1A2F | 0.015 |
| Deuteranopia (no green cones) | #07162E | 0.007 |
| Tritanopia (no blue cones) | #001D20 | 0.038 |
| Achromatopsia (no color) | #171717 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04182E
#04182E
oklch(20.6% 0.051 252.1)
- #241400
#241400
oklch(20.8% 0.044 72.7)
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 #04182E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.020
- Rich Navy #001219 ΔE 0.047
- Navy Blue #001146 ΔE 0.053
- Dark #1B2431 ΔE 0.057
- Oxford Blue #1B263B ΔE 0.064
- Dark Navy #000435 ΔE 0.066
- Jet #212529 ΔE 0.070
- Almost Black #070D0D ΔE 0.071
Use #04182E 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.