#181D2C
Closest named color: Rich Black (#0D1B2A). oklch(23.3% 0.03 269.8), rgb(24, 29, 44).
Aa
White text reads best on this color (16.78:1).
About this color
#181D2C is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.030 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.020 away. White text reads best on it, at 16.78:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.78:1 |
Values
| HEX | #181D2C |
| RGB | rgb(24, 29, 44) |
| HSL | hsl(225, 29%, 13%) |
| OKLCH | oklch(23.3% 0.03 269.8) |
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 #181D2C | 16.78:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #181D2C | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #181D2C text on white | 16.78:1 | AAA | Lc 103.7 | Preferred for body text |
| #181D2C text on black | 1.25:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D4D9E7
oklch(88.6% 0.02 270.2)
-
Step 300
300
#B7C0D8
oklch(80.8% 0.035 269.2)
-
Step 400
400
#92A0C5
oklch(70.8% 0.057 268.7)
-
Step 500
500
#7888B6
oklch(63.2% 0.072 269.5)
-
Step 600
600
#6171A2
oklch(55.6% 0.079 269.9)
-
Step 700
700
#505F8B
oklch(49.2% 0.073 269.2)
-
Step 800
800
#424D71
oklch(42.7% 0.062 270.6)
-
Step 900
900
#38405B
oklch(37.6% 0.048 271.3)
-
Step 950
950 (this color)
#181D2C
oklch(23.3% 0.03 269.8)
#181D2C 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) | #181E2D | 0.004 |
| Deuteranopia (no green cones) | #161D2C | 0.003 |
| Tritanopia (no blue cones) | #122022 | 0.027 |
| Achromatopsia (no color) | #1D1D1D | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181D2C
#181D2C
oklch(23.3% 0.03 269.8)
- #231D0C
#231D0C
oklch(23.3% 0.03 90.5)
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 #181D2C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.020
- Dark #1B2431 ΔE 0.026
- Jet #212529 ΔE 0.036
- Oxford Blue #1B263B ΔE 0.038
- Rich Navy #001219 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.072
- Navy Blue #001146 ΔE 0.076
- Gunmetal #293241 ΔE 0.082
Use #181D2C 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.