#181828
Closest named color: Rich Black (#0D1B2A). oklch(21.7% 0.031 283.5), rgb(24, 24, 40).
Aa
White text reads best on this color (17.49:1).
About this color
#181828 is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.031 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.019 away. White text reads best on it, at 17.49:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.49:1 |
Values
| HEX | #181828 |
| RGB | rgb(24, 24, 40) |
| HSL | hsl(240, 25%, 13%) |
| OKLCH | oklch(21.7% 0.031 283.5) |
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 #181828 | 17.49:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #181828 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #181828 text on white | 17.49:1 | AAA | Lc 104.3 | Preferred for body text |
| #181828 text on black | 1.20:1 | 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
#D7D8E7
oklch(88.6% 0.02 282.9)
-
Step 300
300
#BDBED8
oklch(80.9% 0.036 283.8)
-
Step 400
400
#9B9CC5
oklch(70.6% 0.06 283.7)
-
Step 500
500
#8384B6
oklch(63.2% 0.075 283.2)
-
Step 600
600
#6D6DA2
oklch(55.7% 0.082 283.4)
-
Step 700
700
#5B5B8B
oklch(49.2% 0.076 283.2)
-
Step 800
800
#4A4A71
oklch(42.6% 0.064 283.3)
-
Step 900
900
#3E3E5B
oklch(37.7% 0.049 283.8)
-
Step 950
950 (this color)
#181828
oklch(21.7% 0.031 283.5)
#181828 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) | #131A29 | 0.010 |
| Deuteranopia (no green cones) | #131928 | 0.009 |
| Tritanopia (no blue cones) | #141B1E | 0.027 |
| Achromatopsia (no color) | #191919 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181828
#181828
oklch(21.7% 0.031 283.5)
- #1C1B09
#1C1B09
oklch(21.8% 0.031 105.9)
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 #181828, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.019
- Dark #1B2431 ΔE 0.043
- Jet #212529 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.055
- Rich Navy #001219 ΔE 0.058
- Almost Black #070D0D ΔE 0.073
- Navy Blue #001146 ΔE 0.074
- Very Dark Purple #2A0134 ΔE 0.076
Use #181828 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.