#0A183E
Closest named color: Navy Blue (#001146). oklch(22.4% 0.075 265.4), rgb(10, 24, 62).
Aa
White text reads best on this color (17.31:1).
About this color
#0A183E is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.075 and its hue 265°. 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 17.31:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.21:1 |
| White text | 17.31:1 |
Values
| HEX | #0A183E |
| RGB | rgb(10, 24, 62) |
| HSL | hsl(224, 72%, 14%) |
| OKLCH | oklch(22.4% 0.075 265.4) |
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 #0A183E | 17.31:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #0A183E | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #0A183E text on white | 17.31:1 | AAA | Lc 104.0 | Preferred for body text |
| #0A183E text on black | 1.21:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A5C0FB
oklch(80.9% 0.089 265.4)
-
Step 400
400
#759DF9
oklch(70.7% 0.142 265.2)
-
Step 500
500
#5381F6
oklch(63.1% 0.182 265.4)
-
Step 600
600
#3A67E5
oklch(55.6% 0.198 265.4)
-
Step 700
700
#2D55C7
oklch(49.2% 0.183 265.4)
-
Step 800
800
#2546A1
oklch(42.7% 0.153 265.3)
-
Step 900
900
#223C80
oklch(37.7% 0.119 265.3)
-
Step 950
950 (this color)
#0A183E
oklch(22.4% 0.075 265.4)
#0A183E 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) | #011D3F | 0.017 |
| Deuteranopia (no green cones) | #00183D | 0.013 |
| Tritanopia (no blue cones) | #002128 | 0.059 |
| Achromatopsia (no color) | #1B1B1B | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A183E
#0A183E
oklch(22.4% 0.075 265.4)
- #251900
#251900
oklch(22.3% 0.046 84.4)
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 #0A183E, 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 0.042
- Night Blue #040348 ΔE 0.055
- Oxford Blue #1B263B ΔE 0.056
- Dark #1B2431 ΔE 0.059
- Dark Indigo #1F0954 ΔE 0.060
- Dark Navy #000435 ΔE 0.067
- Darkblue #030764 ΔE 0.076
Use #0A183E 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.