#171131
Closest named color: Rich Black (#0D1B2A). oklch(20.6% 0.061 288.5), rgb(23, 17, 49).
Aa
White text reads best on this color (18.08:1).
About this color
#171131 is a very dark, muted purple. In OKLCH its lightness is 21%, its chroma 0.061 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.041 away. White text reads best on it, at 18.08:1.
| Hue family | Purples |
| Lightness | very dark (21%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.08:1 |
Values
| HEX | #171131 |
| RGB | rgb(23, 17, 49) |
| HSL | hsl(251, 48%, 13%) |
| OKLCH | oklch(20.6% 0.061 288.5) |
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 #171131 | 18.08:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #171131 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #171131 text on white | 18.08:1 | AAA | Lc 104.7 | Preferred for body text |
| #171131 text on black | 1.16:1 | 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
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D7D5F3
oklch(88.4% 0.041 288.6)
-
Step 300
300
#BEBAED
oklch(80.9% 0.072 288.3)
-
Step 400
400
#9E94E4
oklch(70.7% 0.116 288.8)
-
Step 500
500
#8778DC
oklch(63.1% 0.147 288.3)
-
Step 600
600
#725ECA
oklch(55.5% 0.161 288.5)
-
Step 700
700
#604DAF
oklch(49.1% 0.15 288.5)
-
Step 800
800
#4E408D
oklch(42.7% 0.123 288.4)
-
Step 900
900
#413771
oklch(37.8% 0.096 288.9)
-
Step 950
950 (this color)
#171131
oklch(20.6% 0.061 288.5)
#171131 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) | #031732 | 0.034 |
| Deuteranopia (no green cones) | #031530 | 0.033 |
| Tritanopia (no blue cones) | #0F181E | 0.052 |
| Achromatopsia (no color) | #161616 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171131
#171131
oklch(20.6% 0.061 288.5)
- #191900
#191900
oklch(20.7% 0.045 109.8)
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 #171131, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.041
- Midnight Purple #280137 ΔE 0.053
- Navy Blue #001146 ΔE 0.054
- Very Dark Purple #2A0134 ΔE 0.056
- Dark #1B2431 ΔE 0.066
- Dark Navy #000435 ΔE 0.066
- Rich Navy #001219 ΔE 0.067
- Night Blue #040348 ΔE 0.068
Use #171131 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.