#18172D
Closest named color: Rich Black (#0D1B2A). oklch(21.8% 0.043 284.4), rgb(24, 23, 45).
Aa
White text reads best on this color (17.51:1).
About this color
#18172D is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.043 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.023 away. White text reads best on it, at 17.51:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.51:1 |
Values
| HEX | #18172D |
| RGB | rgb(24, 23, 45) |
| HSL | hsl(243, 32%, 13%) |
| OKLCH | oklch(21.8% 0.043 284.4) |
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 #18172D | 17.51:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #18172D | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #18172D text on white | 17.51:1 | AAA | Lc 104.3 | Preferred for body text |
| #18172D 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E8E9F4
oklch(93.6% 0.015 281.9)
-
Step 200
200
#D6D7EC
oklch(88.5% 0.029 283.6)
-
Step 300
300
#BCBDE1
oklch(80.9% 0.051 284)
-
Step 400
400
#9A9AD2
oklch(70.7% 0.081 284.1)
-
Step 500
500
#8280C5
oklch(63% 0.103 284.4)
-
Step 600
600
#6C69B2
oklch(55.6% 0.112 284)
-
Step 700
700
#5B5799
oklch(49.1% 0.104 284.7)
-
Step 800
800
#4A477C
oklch(42.6% 0.086 284.7)
-
Step 900
900
#3E3C64
oklch(37.7% 0.068 285)
-
Step 950
950 (this color)
#18172D
oklch(21.8% 0.043 284.4)
#18172D 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) | #101A2E | 0.016 |
| Deuteranopia (no green cones) | #0F192C | 0.016 |
| Tritanopia (no blue cones) | #121B1F | 0.037 |
| Achromatopsia (no color) | #191919 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18172D
#18172D
oklch(21.8% 0.043 284.4)
- #1D1B02
#1D1B02
oklch(21.8% 0.043 105.3)
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 #18172D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.023
- Dark #1B2431 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.054
- Jet #212529 ΔE 0.056
- Rich Navy #001219 ΔE 0.063
- Navy Blue #001146 ΔE 0.065
- Midnight Purple #280137 ΔE 0.068
- Very Dark Purple #2A0134 ΔE 0.068
Use #18172D 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.