#181729
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.035 285.6), rgb(24, 23, 41).
Aa
White text reads best on this color (17.59:1).
About this color
#181729 is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.035 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 17.59:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.59:1 |
Values
| HEX | #181729 |
| RGB | rgb(24, 23, 41) |
| HSL | hsl(243, 28%, 13%) |
| OKLCH | oklch(21.5% 0.035 285.6) |
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 #181729 | 17.59:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #181729 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #181729 text on white | 17.59:1 | AAA | Lc 104.4 | Preferred for body text |
| #181729 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
#E9E9F2
oklch(93.7% 0.012 286.2)
-
Step 200
200
#D7D7E8
oklch(88.4% 0.023 285.9)
-
Step 300
300
#BDBDDB
oklch(80.8% 0.042 285.4)
-
Step 400
400
#9C9BC9
oklch(70.7% 0.067 285.6)
-
Step 500
500
#8482BB
oklch(63.1% 0.085 285.3)
-
Step 600
600
#6E6BA7
oklch(55.6% 0.092 285.3)
-
Step 700
700
#5C598F
oklch(49.1% 0.085 285.3)
-
Step 800
800
#4B4974
oklch(42.7% 0.071 285.1)
-
Step 900
900
#3F3D5E
oklch(37.7% 0.056 286.2)
-
Step 950
950 (this color)
#181729
oklch(21.5% 0.035 285.6)
#181729 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) | #12192A | 0.012 |
| Deuteranopia (no green cones) | #111829 | 0.012 |
| Tritanopia (no blue cones) | #141A1E | 0.029 |
| Achromatopsia (no color) | #191919 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181729
#181729
oklch(21.5% 0.035 285.6)
- #1C1A06
#1C1A06
oklch(21.4% 0.034 103.8)
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 #181729, 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 0.055
- Oxford Blue #1B263B ΔE 0.056
- Rich Navy #001219 ΔE 0.058
- Navy Blue #001146 ΔE 0.071
- Very Dark Purple #2A0134 ΔE 0.072
- Midnight Purple #280137 ΔE 0.072
Use #181729 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.