#0A152C
Closest named color: Rich Black (#0D1B2A). oklch(20% 0.049 263.4), rgb(10, 21, 44).
Aa
White text reads best on this color (18.15:1).
About this color
#0A152C is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.049 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.024 away. White text reads best on it, at 18.15:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.15:1 |
Values
| HEX | #0A152C |
| RGB | rgb(10, 21, 44) |
| HSL | hsl(221, 63%, 11%) |
| OKLCH | oklch(20% 0.049 263.4) |
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 #0A152C | 18.15:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #0A152C | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #0A152C text on white | 18.15:1 | AAA | Lc 104.8 | Preferred for body text |
| #0A152C text on black | 1.15:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEF
oklch(88.6% 0.032 261.7)
-
Step 300
300
#ADC1E7
oklch(80.9% 0.058 263.2)
-
Step 400
400
#82A0DB
oklch(70.6% 0.093 263.4)
-
Step 500
500
#6388D1
oklch(63.1% 0.118 263)
-
Step 600
600
#4B70BE
oklch(55.5% 0.129 263.6)
-
Step 700
700
#3C5EA4
oklch(49.2% 0.119 263.2)
-
Step 800
800
#324D85
oklch(42.8% 0.099 263.4)
-
Step 900
900
#2C406A
oklch(37.6% 0.077 263.8)
-
Step 950
950 (this color)
#0A152C
oklch(20% 0.049 263.4)
#0A152C 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) | #0B172D | 0.007 |
| Deuteranopia (no green cones) | #06142C | 0.007 |
| Tritanopia (no blue cones) | #001A1E | 0.041 |
| Achromatopsia (no color) | #161616 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A152C
#0A152C
oklch(20% 0.049 263.4)
- #1F1400
#1F1400
oklch(20% 0.041 83.2)
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 #0A152C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.024
- Rich Navy #001219 ΔE 0.045
- Navy Blue #001146 ΔE 0.054
- Dark Navy #000435 ΔE 0.062
- Dark #1B2431 ΔE 0.062
- Almost Black #070D0D ΔE 0.066
- Oxford Blue #1B263B ΔE 0.069
- Dark Navy Blue #00022E ΔE 0.070
Use #0A152C 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.