#18151D
Closest named color: Rich Black (#0D1B2A). oklch(20.3% 0.016 302.1), rgb(24, 21, 29).
Aa
White text reads best on this color (18.04:1).
About this color
#18151D is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.032 away. White text reads best on it, at 18.04:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.04:1 |
Values
| HEX | #18151D |
| RGB | rgb(24, 21, 29) |
| HSL | hsl(263, 16%, 10%) |
| OKLCH | oklch(20.3% 0.016 302.1) |
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 #18151D | 18.04:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #18151D | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #18151D text on white | 18.04:1 | AAA | Lc 104.8 | Preferred for body text |
| #18151D text on black | 1.16:1 | 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
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#DAD7DF
oklch(88.4% 0.011 303.1)
-
Step 300
300
#C3BECB
oklch(80.9% 0.019 303.4)
-
Step 400
400
#A49CB1
oklch(70.6% 0.031 302.9)
-
Step 500
500
#8E849E
oklch(63.1% 0.04 302.8)
-
Step 600
600
#786E89
oklch(55.7% 0.043 301.9)
-
Step 700
700
#655C74
oklch(49.2% 0.039 302.1)
-
Step 800
800
#524B5E
oklch(42.7% 0.032 301.9)
-
Step 900
900
#443E4D
oklch(37.6% 0.026 303.3)
-
Step 950
950 (this color)
#18151D
oklch(20.3% 0.016 302.1)
#18151D 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) | #14161D | 0.008 |
| Deuteranopia (no green cones) | #14161D | 0.008 |
| Tritanopia (no blue cones) | #171618 | 0.012 |
| Achromatopsia (no color) | #161616 | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18151D
#18151D
oklch(20.3% 0.016 302.1)
- #151810
#151810
oklch(20.3% 0.016 124.5)
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 #18151D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.032
- Rich Navy #001219 ΔE 0.047
- Almost Black #070D0D ΔE 0.055
- Dark #1B2431 ΔE 0.058
- Jet #212529 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.073
- Very Dark Brown #1D0200 ΔE 0.077
- Dark Brown #341C02 ΔE 0.082
Use #18151D 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.