#18121D
Closest named color: Rich Black (#0D1B2A). oklch(19.5% 0.023 309.1), rgb(24, 18, 29).
Aa
White text reads best on this color (18.37:1).
About this color
#18121D is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.038 away. White text reads best on it, at 18.37:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.14:1 |
| White text | 18.37:1 |
Values
| HEX | #18121D |
| RGB | rgb(24, 18, 29) |
| HSL | hsl(273, 23%, 9%) |
| OKLCH | oklch(19.5% 0.023 309.1) |
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 #18121D | 18.37:1 | AAA | Lc -107.1 | Preferred for body text |
| Black text on #18121D | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #18121D text on white | 18.37:1 | AAA | Lc 105.0 | Preferred for body text |
| #18121D text on black | 1.14:1 | 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
#EBE8EE
oklch(93.5% 0.009 308.4)
-
Step 200
200
#DCD6E1
oklch(88.4% 0.016 310.1)
-
Step 300
300
#C6BCCF
oklch(80.9% 0.028 309.2)
-
Step 400
400
#A999B6
oklch(70.6% 0.045 309.9)
-
Step 500
500
#9480A4
oklch(63.1% 0.058 309.8)
-
Step 600
600
#7E6A8F
oklch(55.7% 0.061 309)
-
Step 700
700
#6A587A
oklch(49.1% 0.057 308.4)
-
Step 800
800
#574863
oklch(42.8% 0.048 309.6)
-
Step 900
900
#473C51
oklch(37.6% 0.038 308.4)
-
Step 950
950 (this color)
#18121D
oklch(19.5% 0.023 309.1)
#18121D 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) | #10141D | 0.017 |
| Deuteranopia (no green cones) | #11141D | 0.015 |
| Tritanopia (no blue cones) | #171316 | 0.016 |
| Achromatopsia (no color) | #141414 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18121D
#18121D
oklch(19.5% 0.023 309.1)
- #12170C
#12170C
oklch(19.5% 0.022 128.2)
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 #18121D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.038
- Rich Navy #001219 ΔE 0.046
- Almost Black #070D0D ΔE 0.051
- Dark #1B2431 ΔE 0.067
- Jet #212529 ΔE 0.070
- Very Dark Brown #1D0200 ΔE 0.072
- Very Dark Purple #2A0134 ΔE 0.077
- Midnight Purple #280137 ΔE 0.079
Use #18121D 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.