#23181D
Closest named color: Rich Black (#0D1B2A). oklch(22.5% 0.02 349.8), rgb(35, 24, 29).
Aa
White text reads best on this color (17.21:1).
About this color
#23181D is a very dark close to neutral grey. In OKLCH its lightness is 22%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.044 away. White text reads best on it, at 17.21:1.
| Hue family | Neutrals |
| Lightness | very dark (22%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.21:1 |
Values
| HEX | #23181D |
| RGB | rgb(35, 24, 29) |
| HSL | hsl(333, 19%, 12%) |
| OKLCH | oklch(22.5% 0.02 349.8) |
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 #23181D | 17.21:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #23181D | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #23181D text on white | 17.21:1 | AAA | Lc 104.1 | Preferred for body text |
| #23181D text on black | 1.21:1 | 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
#F7F5F6
oklch(97.2% 0.002 345.2)
-
Step 100
100
#EEE8EA
oklch(93.6% 0.007 354.8)
-
Step 200
200
#E0D6DA
oklch(88.5% 0.012 351)
-
Step 300
300
#CDBBC3
oklch(80.9% 0.023 348.9)
-
Step 400
400
#B498A4
oklch(70.8% 0.037 350.4)
-
Step 500
500
#A17E8E
oklch(63.2% 0.048 349.4)
-
Step 600
600
#8B6778
oklch(55.6% 0.052 349)
-
Step 700
700
#765665
oklch(49.2% 0.048 349.2)
-
Step 800
800
#604652
oklch(42.6% 0.04 349.6)
-
Step 900
900
#4F3B44
oklch(37.7% 0.031 350)
-
Step 950
950 (this color)
#23181D
oklch(22.5% 0.02 349.8)
#23181D 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) | #191A1D | 0.021 |
| Deuteranopia (no green cones) | #1B1C1D | 0.020 |
| Tritanopia (no blue cones) | #25181A | 0.007 |
| Achromatopsia (no color) | #1B1B1B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23181D
#23181D
oklch(22.5% 0.02 349.8)
- #121F1A
#121F1A
oklch(22.5% 0.021 168.5)
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 #23181D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.044
- Jet #212529 ΔE 0.044
- Dark #1B2431 ΔE 0.048
- Dark Brown #341C02 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.064
- Rich Navy #001219 ΔE 0.072
- Dark Maroon #3C0008 ΔE 0.074
- Almost Black #070D0D ΔE 0.078
Use #23181D 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.