#0A102C
Closest named color: Rich Black (#0D1B2A). oklch(18.7% 0.057 270.8), rgb(10, 16, 44).
Aa
White text reads best on this color (18.69:1).
About this color
#0A102C is a very dark, muted blue. In OKLCH its lightness is 19%, its chroma 0.057 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.041 away. White text reads best on it, at 18.69:1.
| Hue family | Blues |
| Lightness | very dark (19%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.12:1 |
| White text | 18.69:1 |
Values
| HEX | #0A102C |
| RGB | rgb(10, 16, 44) |
| HSL | hsl(229, 63%, 11%) |
| OKLCH | oklch(18.7% 0.057 270.8) |
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 #0A102C | 18.69:1 | AAA | Lc -107.2 | Preferred for body text |
| Black text on #0A102C | 1.12:1 | Fails | Lc 0.0 | Not readable |
| #0A102C text on white | 18.69:1 | AAA | Lc 105.1 | Preferred for body text |
| #0A102C text on black | 1.12:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F3
oklch(88.5% 0.038 272.5)
-
Step 300
300
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#879DE4
oklch(70.7% 0.107 270.3)
-
Step 500
500
#6B83DC
oklch(63.2% 0.137 270.7)
-
Step 600
600
#546ACA
oklch(55.6% 0.15 271.1)
-
Step 700
700
#4458AF
oklch(49.1% 0.14 270.7)
-
Step 800
800
#38488D
oklch(42.6% 0.115 271)
-
Step 900
900
#303D71
oklch(37.6% 0.09 271)
-
Step 950
950 (this color)
#0A102C
oklch(18.7% 0.057 270.8)
#0A102C 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) | #02142D | 0.017 |
| Deuteranopia (no green cones) | #00112B | 0.017 |
| Tritanopia (no blue cones) | #00171B | 0.050 |
| Achromatopsia (no color) | #121212 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A102C
#0A102C
oklch(18.7% 0.057 270.8)
- #191200
#191200
oklch(18.6% 0.038 91.7)
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 #0A102C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.041
- Rich Navy #001219 ΔE 0.046
- Dark Navy #000435 ΔE 0.048
- Navy Blue #001146 ΔE 0.052
- Midnight #03012D ΔE 0.054
- Dark Navy Blue #00022E ΔE 0.055
- Very Dark Blue #000133 ΔE 0.057
- Night Blue #040348 ΔE 0.063
Use #0A102C 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.