#181721
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.02 289.2), rgb(24, 23, 33).
Aa
White text reads best on this color (17.74:1).
About this color
#181721 is a very dark close to neutral grey. In OKLCH its lightness is 21%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.024 away. White text reads best on it, at 17.74:1.
| Hue family | Neutrals |
| Lightness | very dark (21%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.74:1 |
Values
| HEX | #181721 |
| RGB | rgb(24, 23, 33) |
| HSL | hsl(246, 18%, 11%) |
| OKLCH | oklch(21.1% 0.02 289.2) |
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 #181721 | 17.74:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #181721 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #181721 text on white | 17.74:1 | AAA | Lc 104.5 | Preferred for body text |
| #181721 text on black | 1.18:1 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9E9EE
oklch(93.5% 0.007 286.3)
-
Step 200
200
#D8D8E1
oklch(88.5% 0.012 286.1)
-
Step 300
300
#C0BECF
oklch(80.8% 0.024 291.3)
-
Step 400
400
#9F9DB7
oklch(70.6% 0.038 288.9)
-
Step 500
500
#8885A5
oklch(63.1% 0.048 289.2)
-
Step 600
600
#726F90
oklch(55.7% 0.051 288.8)
-
Step 700
700
#605C7B
oklch(49.1% 0.049 290.4)
-
Step 800
800
#4E4C64
oklch(42.8% 0.039 288.4)
-
Step 900
900
#413F51
oklch(37.7% 0.031 289.9)
-
Step 950
950 (this color)
#181721
oklch(21.1% 0.02 289.2)
#181721 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) | #151821 | 0.006 |
| Deuteranopia (no green cones) | #151821 | 0.006 |
| Tritanopia (no blue cones) | #16191A | 0.018 |
| Achromatopsia (no color) | #181818 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181721
#181721
oklch(21.1% 0.02 289.2)
- #19190F
#19190F
oklch(21% 0.019 107.9)
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 #181721, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.024
- Dark #1B2431 ΔE 0.050
- Rich Navy #001219 ΔE 0.051
- Jet #212529 ΔE 0.053
- Almost Black #070D0D ΔE 0.062
- Oxford Blue #1B263B ΔE 0.064
- Dark Brown #341C02 ΔE 0.082
- Very Dark Purple #2A0134 ΔE 0.082
Use #181721 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.