#0A183B
Closest named color: Navy Blue (#001146). oklch(22.1% 0.07 264.8), rgb(10, 24, 59).
Aa
White text reads best on this color (17.40:1).
About this color
#0A183B is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.070 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.034 away. White text reads best on it, at 17.40:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.20:1 |
| White text | 17.40:1 |
Values
| HEX | #0A183B |
| RGB | rgb(10, 24, 59) |
| HSL | hsl(223, 71%, 14%) |
| OKLCH | oklch(22.1% 0.07 264.8) |
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 #0A183B | 17.40:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #0A183B | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #0A183B text on white | 17.40:1 | AAA | Lc 104.1 | Preferred for body text |
| #0A183B 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A6C0F7
oklch(80.8% 0.083 264.9)
-
Step 400
400
#779EF4
oklch(70.7% 0.134 264.7)
-
Step 500
500
#5583EF
oklch(63.1% 0.17 264.7)
-
Step 600
600
#3C69DE
oklch(55.5% 0.186 265)
-
Step 700
700
#2E57C1
oklch(49.1% 0.173 264.7)
-
Step 800
800
#27489C
oklch(42.8% 0.143 264.8)
-
Step 900
900
#233D7C
oklch(37.7% 0.112 264.7)
-
Step 950
950 (this color)
#0A183B
oklch(22.1% 0.07 264.8)
#0A183B 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) | #041C3C | 0.013 |
| Deuteranopia (no green cones) | #00183A | 0.013 |
| Tritanopia (no blue cones) | #002026 | 0.056 |
| Achromatopsia (no color) | #1A1A1A | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A183B
#0A183B
oklch(22.1% 0.07 264.8)
- #241900
#241900
oklch(22.1% 0.045 86.5)
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 #0A183B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.034
- Rich Black #0D1B2A ΔE 0.037
- Oxford Blue #1B263B ΔE 0.056
- Dark #1B2431 ΔE 0.057
- Night Blue #040348 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.064
- Dark Navy #000435 ΔE 0.066
- Rich Navy #001219 ΔE 0.073
Use #0A183B 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.