#181728
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.033 285.9), rgb(24, 23, 40).
Aa
White text reads best on this color (17.61:1).
About this color
#181728 is a very dark, muted purple. In OKLCH its lightness is 21%, its chroma 0.033 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 17.61:1.
| Hue family | Purples |
| Lightness | very dark (21%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.61:1 |
Values
| HEX | #181728 |
| RGB | rgb(24, 23, 40) |
| HSL | hsl(244, 27%, 12%) |
| OKLCH | oklch(21.5% 0.033 285.9) |
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 #181728 | 17.61:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #181728 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #181728 text on white | 17.61:1 | AAA | Lc 104.4 | Preferred for body text |
| #181728 text on black | 1.19:1 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F1
oklch(93.6% 0.011 286.2)
-
Step 200
200
#D7D7E7
oklch(88.4% 0.022 285.9)
-
Step 300
300
#BEBDDA
oklch(80.8% 0.041 287)
-
Step 400
400
#9D9BC7
oklch(70.7% 0.064 286.7)
-
Step 500
500
#8582B8
oklch(63% 0.081 286.4)
-
Step 600
600
#6F6BA4
oklch(55.5% 0.088 286.4)
-
Step 700
700
#5D598D
oklch(49% 0.082 286.5)
-
Step 800
800
#4C4972
oklch(42.7% 0.067 286.5)
-
Step 900
900
#3F3D5C
oklch(37.6% 0.053 286.5)
-
Step 950
950 (this color)
#181728
oklch(21.5% 0.033 285.9)
#181728 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) | #121929 | 0.012 |
| Deuteranopia (no green cones) | #121828 | 0.011 |
| Tritanopia (no blue cones) | #141A1D | 0.029 |
| Achromatopsia (no color) | #191919 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181728
#181728
oklch(21.5% 0.033 285.9)
- #1B1A07
#1B1A07
oklch(21.3% 0.033 106.2)
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 #181728, 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 0.046
- Jet #212529 ΔE 0.054
- Rich Navy #001219 ΔE 0.057
- Oxford Blue #1B263B ΔE 0.057
- Almost Black #070D0D ΔE 0.071
- Navy Blue #001146 ΔE 0.073
- Very Dark Purple #2A0134 ΔE 0.073
Use #181728 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.