#181733
Closest named color: Rich Black (#0D1B2A). oklch(22.2% 0.053 282.8), rgb(24, 23, 51).
Aa
White text reads best on this color (17.36:1).
About this color
#181733 is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.053 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.030 away. White text reads best on it, at 17.36:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.36:1 |
Values
| HEX | #181733 |
| RGB | rgb(24, 23, 51) |
| HSL | hsl(242, 38%, 15%) |
| OKLCH | oklch(22.2% 0.053 282.8) |
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 #181733 | 17.36:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #181733 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #181733 text on white | 17.36:1 | AAA | Lc 104.2 | Preferred for body text |
| #181733 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#BABCE9
oklch(80.9% 0.063 282.9)
-
Step 400
400
#9798DE
oklch(70.6% 0.102 282.8)
-
Step 500
500
#7F7ED5
oklch(63.2% 0.129 282.6)
-
Step 600
600
#6965C2
oklch(55.5% 0.141 282.7)
-
Step 700
700
#5854A8
oklch(49.2% 0.131 282.6)
-
Step 800
800
#484588
oklch(42.8% 0.108 282.8)
-
Step 900
900
#3C3A6D
oklch(37.7% 0.086 283.3)
-
Step 950
950 (this color)
#181733
oklch(22.2% 0.053 282.8)
#181733 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) | #0C1B34 | 0.021 |
| Deuteranopia (no green cones) | #0A1932 | 0.022 |
| Tritanopia (no blue cones) | #0F1D22 | 0.047 |
| Achromatopsia (no color) | #1A1A1A | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181733
#181733
oklch(22.2% 0.053 282.8)
- #1F1C00
#1F1C00
oklch(22.3% 0.047 104)
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 #181733, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.030
- Dark #1B2431 ΔE 0.047
- Oxford Blue #1B263B ΔE 0.051
- Navy Blue #001146 ΔE 0.057
- Jet #212529 ΔE 0.061
- Midnight Purple #280137 ΔE 0.063
- Very Dark Purple #2A0134 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.070
Use #181733 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.