#0A172B
Closest named color: Rich Black (#0D1B2A). oklch(20.5% 0.044 258.7), rgb(10, 23, 43).
Aa
White text reads best on this color (17.94:1).
About this color
#0A172B is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.044 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.94:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.94:1 |
Values
| HEX | #0A172B |
| RGB | rgb(10, 23, 43) |
| HSL | hsl(216, 62%, 10%) |
| OKLCH | oklch(20.5% 0.044 258.7) |
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 #0A172B | 17.94:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #0A172B | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #0A172B text on white | 17.94:1 | AAA | Lc 104.6 | Preferred for body text |
| #0A172B text on black | 1.17:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E3
oklch(80.9% 0.052 259.4)
-
Step 400
400
#81A2D5
oklch(70.7% 0.084 258.9)
-
Step 500
500
#618ACA
oklch(63.1% 0.107 259)
-
Step 600
600
#4773B7
oklch(55.6% 0.117 258.8)
-
Step 700
700
#39609D
oklch(49% 0.108 259)
-
Step 800
800
#2F4F7F
oklch(42.7% 0.089 258.3)
-
Step 900
900
#2A4266
oklch(37.7% 0.069 258.3)
-
Step 950
950 (this color)
#0A172B
oklch(20.5% 0.044 258.7)
#0A172B 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) | #0E192C | 0.010 |
| Deuteranopia (no green cones) | #0A152B | 0.007 |
| Tritanopia (no blue cones) | #001C1E | 0.039 |
| Achromatopsia (no color) | #171717 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A172B
#0A172B
oklch(20.5% 0.044 258.7)
- #211400
#211400
oklch(20.3% 0.042 78.8)
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 #0A172B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Rich Navy #001219 ΔE 0.045
- Dark #1B2431 ΔE 0.055
- Navy Blue #001146 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.064
- Almost Black #070D0D ΔE 0.066
- Jet #212529 ΔE 0.067
- Dark Navy #000435 ΔE 0.069
Use #0A172B 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.