#181031
Closest named color: Rich Black (#0D1B2A). oklch(20.5% 0.063 291), rgb(24, 16, 49).
Aa
White text reads best on this color (18.14:1).
About this color
#181031 is a very dark, muted purple. In OKLCH its lightness is 20%, its chroma 0.063 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.044 away. White text reads best on it, at 18.14:1.
| Hue family | Purples |
| Lightness | very dark (20%) |
| Chroma | muted (0.063) |
| Temperature | in between |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.14:1 |
Values
| HEX | #181031 |
| RGB | rgb(24, 16, 49) |
| HSL | hsl(255, 51%, 13%) |
| OKLCH | oklch(20.5% 0.063 291) |
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 #181031 | 18.14:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #181031 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #181031 text on white | 18.14:1 | AAA | Lc 104.7 | Preferred for body text |
| #181031 text on black | 1.15:1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D9D5F3
oklch(88.5% 0.041 291.7)
-
Step 300
300
#C0B9EE
oklch(81% 0.074 290.7)
-
Step 400
400
#A193E5
oklch(70.8% 0.118 290.9)
-
Step 500
500
#8B76DD
oklch(63.1% 0.151 290.8)
-
Step 600
600
#765CCB
oklch(55.6% 0.165 290.8)
-
Step 700
700
#644BB0
oklch(49.2% 0.154 291.1)
-
Step 800
800
#513E8E
oklch(42.7% 0.127 291)
-
Step 900
900
#433671
oklch(37.8% 0.098 291.1)
-
Step 950
950 (this color)
#181031
oklch(20.5% 0.063 291)
#181031 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) | #021632 | 0.038 |
| Deuteranopia (no green cones) | #031530 | 0.036 |
| Tritanopia (no blue cones) | #11171E | 0.051 |
| Achromatopsia (no color) | #161616 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181031
#181031
oklch(20.5% 0.063 291)
- #181900
#181900
oklch(20.5% 0.045 111.8)
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 #181031, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.044
- Midnight Purple #280137 ΔE 0.050
- Very Dark Purple #2A0134 ΔE 0.052
- Navy Blue #001146 ΔE 0.056
- Dark Navy #000435 ΔE 0.066
- Dark #1B2431 ΔE 0.068
- Night Blue #040348 ΔE 0.068
- Dark Indigo #1F0954 ΔE 0.068
Use #181031 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.