#181639
Closest named color: Rich Black (#0D1B2A). oklch(22.5% 0.066 282.3), rgb(24, 22, 57).
Aa
White text reads best on this color (17.31:1).
About this color
#181639 is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.066 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.040 away. White text reads best on it, at 17.31:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.31:1 |
Values
| HEX | #181639 |
| RGB | rgb(24, 22, 57) |
| HSL | hsl(243, 44%, 15%) |
| OKLCH | oklch(22.5% 0.066 282.3) |
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 #181639 | 17.31:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #181639 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #181639 text on white | 17.31:1 | AAA | Lc 104.1 | Preferred for body text |
| #181639 text on black | 1.21:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F6
oklch(88.5% 0.044 282.6)
-
Step 300
300
#B8BBF2
oklch(80.9% 0.077 282.1)
-
Step 400
400
#9596EC
oklch(70.7% 0.125 282.2)
-
Step 500
500
#7D79E6
oklch(63.1% 0.16 282.5)
-
Step 600
600
#6860D4
oklch(55.7% 0.173 282.3)
-
Step 700
700
#574EB7
oklch(49.1% 0.16 282.6)
-
Step 800
800
#474194
oklch(42.8% 0.132 282.5)
-
Step 900
900
#3B3876
oklch(37.8% 0.103 282.5)
-
Step 950
950 (this color)
#181639
oklch(22.5% 0.066 282.3)
#181639 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) | #051C3A | 0.030 |
| Deuteranopia (no green cones) | #031938 | 0.030 |
| Tritanopia (no blue cones) | #0C1E24 | 0.058 |
| Achromatopsia (no color) | #1A1A1A | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181639
#181639
oklch(22.5% 0.066 282.3)
- #201C00
#201C00
oklch(22.4% 0.047 102)
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 #181639, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.040
- Navy Blue #001146 ΔE 0.048
- Oxford Blue #1B263B ΔE 0.053
- Dark #1B2431 ΔE 0.053
- Dark Indigo #1F0954 ΔE 0.058
- Midnight Purple #280137 ΔE 0.059
- Very Dark Purple #2A0134 ΔE 0.062
- Night Blue #040348 ΔE 0.068
Use #181639 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.