#181529
Closest named color: Rich Black (#0D1B2A). oklch(21% 0.039 289.5), rgb(24, 21, 41).
Aa
White text reads best on this color (17.82:1).
About this color
#181529 is a very dark, muted purple. In OKLCH its lightness is 21%, its chroma 0.039 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 17.82:1.
| Hue family | Purples |
| Lightness | very dark (21%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.82:1 |
Values
| HEX | #181529 |
| RGB | rgb(24, 21, 41) |
| HSL | hsl(249, 32%, 12%) |
| OKLCH | oklch(21% 0.039 289.5) |
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 #181529 | 17.82:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #181529 | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #181529 text on white | 17.82:1 | AAA | Lc 104.6 | Preferred for body text |
| #181529 text on black | 1.17:1 | 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
#D8D7E9
oklch(88.5% 0.025 288.4)
-
Step 300
300
#BFBCDD
oklch(80.8% 0.046 289.5)
-
Step 400
400
#9F99CC
oklch(70.6% 0.074 289.8)
-
Step 500
500
#8880BF
oklch(63.2% 0.094 289.2)
-
Step 600
600
#7268AB
oklch(55.5% 0.103 289.5)
-
Step 700
700
#605693
oklch(49% 0.096 289.9)
-
Step 800
800
#4E4777
oklch(42.7% 0.078 289.3)
-
Step 900
900
#413C60
oklch(37.8% 0.061 289.5)
-
Step 950
950 (this color)
#181529
oklch(21% 0.039 289.5)
#181529 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) | #0F182A | 0.018 |
| Deuteranopia (no green cones) | #0F1729 | 0.017 |
| Tritanopia (no blue cones) | #14191D | 0.033 |
| Achromatopsia (no color) | #181818 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181529
#181529
oklch(21% 0.039 289.5)
- #1A1A03
#1A1A03
oklch(21.1% 0.04 109.4)
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 #181529, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Dark #1B2431 ΔE 0.052
- Rich Navy #001219 ΔE 0.057
- Jet #212529 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.062
- Midnight Purple #280137 ΔE 0.067
- Very Dark Purple #2A0134 ΔE 0.067
- Navy Blue #001146 ΔE 0.070
Use #181529 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.