#181E2B
Closest named color: Rich Black (#0D1B2A). oklch(23.5% 0.027 265.2), rgb(24, 30, 43).
Aa
White text reads best on this color (16.67:1).
About this color
#181E2B is a very dark close to neutral grey. In OKLCH its lightness is 24%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 16.67:1.
| Hue family | Neutrals |
| Lightness | very dark (24%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.67:1 |
Values
| HEX | #181E2B |
| RGB | rgb(24, 30, 43) |
| HSL | hsl(221, 28%, 13%) |
| OKLCH | oklch(23.5% 0.027 265.2) |
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 #181E2B | 16.67:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #181E2B | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #181E2B text on white | 16.67:1 | AAA | Lc 103.6 | Preferred for body text |
| #181E2B 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B7C1D6
oklch(81% 0.032 265.3)
-
Step 400
400
#91A1C1
oklch(70.8% 0.05 264.2)
-
Step 500
500
#7689B1
oklch(63% 0.065 264.8)
-
Step 600
600
#5F739D
oklch(55.6% 0.07 264.6)
-
Step 700
700
#4F6086
oklch(49.1% 0.065 265.5)
-
Step 800
800
#404E6D
oklch(42.5% 0.055 265.4)
-
Step 900
900
#374158
oklch(37.6% 0.042 266.2)
-
Step 950
950 (this color)
#181E2B
oklch(23.5% 0.027 265.2)
#181E2B 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) | #1A1F2C | 0.005 |
| Deuteranopia (no green cones) | #181D2B | 0.004 |
| Tritanopia (no blue cones) | #122122 | 0.026 |
| Achromatopsia (no color) | #1E1E1E | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181E2B
#181E2B
oklch(23.5% 0.027 265.2)
- #241D0F
#241D0F
oklch(23.5% 0.027 83.9)
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 #181E2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.023
- Jet #212529 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.037
- Rich Navy #001219 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.071
- Navy Blue #001146 ΔE 0.080
- Gunmetal #293241 ΔE 0.080
Use #181E2B 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.