#10172B
Closest named color: Rich Black (#0D1B2A). oklch(20.9% 0.041 268.1), rgb(16, 23, 43).
Aa
White text reads best on this color (17.80:1).
About this color
#10172B is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.041 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.015 away. White text reads best on it, at 17.80:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.80:1 |
Values
| HEX | #10172B |
| RGB | rgb(16, 23, 43) |
| HSL | hsl(224, 46%, 12%) |
| OKLCH | oklch(20.9% 0.041 268.1) |
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 #10172B | 17.80:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #10172B | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #10172B text on white | 17.80:1 | AAA | Lc 104.5 | Preferred for body text |
| #10172B 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8C9FD2
oklch(70.7% 0.078 268.6)
-
Step 500
500
#7087C6
oklch(63.2% 0.099 268.2)
-
Step 600
600
#5870B3
oklch(55.7% 0.108 267.9)
-
Step 700
700
#485D9A
oklch(49% 0.101 268.2)
-
Step 800
800
#3B4C7D
oklch(42.6% 0.084 268.2)
-
Step 900
900
#334064
oklch(37.7% 0.064 268.1)
-
Step 950
950 (this color)
#10172B
oklch(20.9% 0.041 268.1)
#10172B 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) | #0F192C | 0.007 |
| Deuteranopia (no green cones) | #0C172B | 0.006 |
| Tritanopia (no blue cones) | #051B1E | 0.037 |
| Achromatopsia (no color) | #181818 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10172B
#10172B
oklch(20.9% 0.041 268.1)
- #201701
#201701
oklch(21% 0.041 88.5)
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 #10172B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.015
- Rich Navy #001219 ΔE 0.050
- Dark #1B2431 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.060
- Navy Blue #001146 ΔE 0.061
- Jet #212529 ΔE 0.062
- Almost Black #070D0D ΔE 0.069
- Dark Navy #000435 ΔE 0.074
Use #10172B 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.