#05182A
Closest named color: Rich Black (#0D1B2A). oklch(20.4% 0.044 248.9), rgb(5, 24, 42).
Aa
White text reads best on this color (17.94:1).
About this color
#05182A is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.044 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.94:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.94:1 |
Values
| HEX | #05182A |
| RGB | rgb(5, 24, 42) |
| HSL | hsl(209, 79%, 9%) |
| OKLCH | oklch(20.4% 0.044 248.9) |
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 #05182A | 17.94:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #05182A | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #05182A text on white | 17.94:1 | AAA | Lc 104.6 | Preferred for body text |
| #05182A 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A7C4E2
oklch(80.9% 0.053 249.4)
-
Step 400
400
#77A5D3
oklch(70.7% 0.084 249.1)
-
Step 500
500
#528EC7
oklch(63.1% 0.107 248.7)
-
Step 600
600
#3577B4
oklch(55.6% 0.116 249.2)
-
Step 700
700
#27649B
oklch(49.1% 0.108 249)
-
Step 800
800
#22527E
oklch(42.8% 0.09 249)
-
Step 900
900
#214465
oklch(37.7% 0.07 248.9)
-
Step 950
950 (this color)
#05182A
oklch(20.4% 0.044 248.9)
#05182A 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) | #10192B | 0.016 |
| Deuteranopia (no green cones) | #0A152A | 0.012 |
| Tritanopia (no blue cones) | #001C1F | 0.031 |
| Achromatopsia (no color) | #171717 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05182A
#05182A
oklch(20.4% 0.044 248.9)
- #241200
#241200
oklch(20.3% 0.045 67.2)
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 #05182A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Rich Navy #001219 ΔE 0.041
- Dark #1B2431 ΔE 0.057
- Navy Blue #001146 ΔE 0.061
- Almost Black #070D0D ΔE 0.065
- Oxford Blue #1B263B ΔE 0.066
- Jet #212529 ΔE 0.068
- Dark Navy #000435 ΔE 0.070
Use #05182A 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.