#10172D
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.045 269), rgb(16, 23, 45).
Aa
White text reads best on this color (17.75:1).
About this color
#10172D is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.045 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.017 away. White text reads best on it, at 17.75:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.75:1 |
Values
| HEX | #10172D |
| RGB | rgb(16, 23, 45) |
| HSL | hsl(226, 48%, 12%) |
| OKLCH | oklch(21.1% 0.045 269) |
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 #10172D | 17.75:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #10172D | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #10172D text on white | 17.75:1 | AAA | Lc 104.5 | Preferred for body text |
| #10172D text on black | 1.18:1 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8B9FD6
oklch(70.8% 0.084 268.8)
-
Step 500
500
#6E86CB
oklch(63.1% 0.108 268.6)
-
Step 600
600
#576FB8
oklch(55.7% 0.117 268.7)
-
Step 700
700
#475C9F
oklch(49.1% 0.11 269)
-
Step 800
800
#3B4C81
oklch(42.9% 0.091 268.9)
-
Step 900
900
#323F67
oklch(37.6% 0.071 269.2)
-
Step 950
950 (this color)
#10172D
oklch(21.1% 0.045 269)
#10172D 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) | #0E192E | 0.007 |
| Deuteranopia (no green cones) | #0B172D | 0.007 |
| Tritanopia (no blue cones) | #041C1F | 0.041 |
| Achromatopsia (no color) | #181818 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10172D
#10172D
oklch(21.1% 0.045 269)
- #201700
#201700
oklch(21% 0.043 89.6)
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 #10172D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.017
- Dark #1B2431 ΔE 0.051
- Rich Navy #001219 ΔE 0.053
- Navy Blue #001146 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.059
- Jet #212529 ΔE 0.063
- Dark Navy #000435 ΔE 0.072
- Almost Black #070D0D ΔE 0.072
Use #10172D 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.