#181737
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.061 281.8), rgb(24, 23, 55).
Aa
White text reads best on this color (17.26:1).
About this color
#181737 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.061 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.036 away. White text reads best on it, at 17.26:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.26:1 |
Values
| HEX | #181737 |
| RGB | rgb(24, 23, 55) |
| HSL | hsl(242, 41%, 15%) |
| OKLCH | oklch(22.6% 0.061 281.8) |
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 #181737 | 17.26:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #181737 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #181737 text on white | 17.26:1 | AAA | Lc 104.0 | Preferred for body text |
| #181737 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
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F4
oklch(88.6% 0.04 280.9)
-
Step 300
300
#B8BCEF
oklch(81% 0.072 281.2)
-
Step 400
400
#9597E6
oklch(70.6% 0.115 281.9)
-
Step 500
500
#7D7CDF
oklch(63.2% 0.146 281.8)
-
Step 600
600
#6762CD
oklch(55.5% 0.161 281.9)
-
Step 700
700
#5651B1
oklch(49.1% 0.148 281.8)
-
Step 800
800
#46438F
oklch(42.7% 0.122 281.7)
-
Step 900
900
#3A3972
oklch(37.6% 0.095 281.6)
-
Step 950
950 (this color)
#181737
oklch(22.6% 0.061 281.8)
#181737 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) | #091C38 | 0.025 |
| Deuteranopia (no green cones) | #071A36 | 0.025 |
| Tritanopia (no blue cones) | #0D1E24 | 0.052 |
| Achromatopsia (no color) | #1B1B1B | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181737
#181737
oklch(22.6% 0.061 281.8)
- #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 #181737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.036
- Dark #1B2431 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.050
- Navy Blue #001146 ΔE 0.052
- Midnight Purple #280137 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.063
- Very Dark Purple #2A0134 ΔE 0.064
- Jet #212529 ΔE 0.064
Use #181737 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.