#181D2A
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.026 268.1), rgb(24, 29, 42).
Aa
White text reads best on this color (16.82:1).
About this color
#181D2A is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.019 away. White text reads best on it, at 16.82:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.82:1 |
Values
| HEX | #181D2A |
| RGB | rgb(24, 29, 42) |
| HSL | hsl(223, 27%, 13%) |
| OKLCH | oklch(23.2% 0.026 268.1) |
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 #181D2A | 16.82:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #181D2A | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #181D2A text on white | 16.82:1 | AAA | Lc 103.7 | Preferred for body text |
| #181D2A text on black | 1.24:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E5
oklch(88.5% 0.017 267.8)
-
Step 300
300
#B8C0D5
oklch(80.8% 0.031 269.1)
-
Step 400
400
#93A0C1
oklch(70.7% 0.051 268.2)
-
Step 500
500
#7988B1
oklch(63% 0.064 268.9)
-
Step 600
600
#62729D
oklch(55.6% 0.07 268.4)
-
Step 700
700
#515F86
oklch(49% 0.065 268.8)
-
Step 800
800
#424E6D
oklch(42.7% 0.054 267.8)
-
Step 900
900
#384158
oklch(37.7% 0.041 267.9)
-
Step 950
950 (this color)
#181D2A
oklch(23.2% 0.026 268.1)
#181D2A 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) | #191E2B | 0.004 |
| Deuteranopia (no green cones) | #171C2A | 0.004 |
| Tritanopia (no blue cones) | #132021 | 0.025 |
| Achromatopsia (no color) | #1D1D1D | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181D2A
#181D2A
oklch(23.2% 0.026 268.1)
- #231D0F
#231D0F
oklch(23.3% 0.026 87.2)
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 #181D2A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.019
- Dark #1B2431 ΔE 0.026
- Jet #212529 ΔE 0.035
- Oxford Blue #1B263B ΔE 0.041
- Rich Navy #001219 ΔE 0.067
- Space Cadet #2B2D42 ΔE 0.074
- Navy Blue #001146 ΔE 0.079
- Dark Brown #341C02 ΔE 0.082
Use #181D2A 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.