#0A173C
Closest named color: Navy Blue (#001146). oklch(21.9% 0.074 265.9), rgb(10, 23, 60).
Aa
White text reads best on this color (17.48:1).
About this color
#0A173C is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.074 and its hue 266°. 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 17.48:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.20:1 |
| White text | 17.48:1 |
Values
| HEX | #0A173C |
| RGB | rgb(10, 23, 60) |
| HSL | hsl(224, 71%, 14%) |
| OKLCH | oklch(21.9% 0.074 265.9) |
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 #0A173C | 17.48:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #0A173C | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #0A173C text on white | 17.48:1 | AAA | Lc 104.1 | Preferred for body text |
| #0A173C 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#779DF7
oklch(70.7% 0.139 265.7)
-
Step 500
500
#5681F4
oklch(63.1% 0.178 266)
-
Step 600
600
#3D67E3
oklch(55.6% 0.194 266)
-
Step 700
700
#3055C5
oklch(49.1% 0.18 266)
-
Step 800
800
#28469F
oklch(42.6% 0.149 266.1)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950 (this color)
#0A173C
oklch(21.9% 0.074 265.9)
#0A173C 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) | #011C3D | 0.017 |
| Deuteranopia (no green cones) | #00173B | 0.013 |
| Tritanopia (no blue cones) | #002026 | 0.060 |
| Achromatopsia (no color) | #1A1A1A | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A173C
#0A173C
oklch(21.9% 0.074 265.9)
- #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 #0A173C, 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 0.040
- Night Blue #040348 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.059
- Dark #1B2431 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.062
- Dark Navy #000435 ΔE 0.064
- Rich Navy #001219 ΔE 0.075
Use #0A173C 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.