#42318B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.143 286.4), rgb(66, 49, 139).
Aa
White text reads best on this color (10.27:1).
About this color
#42318B is a dark, vivid purple. In OKLCH its lightness is 39%, its chroma 0.143 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 10.27:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.04:1 |
| White text | 10.27:1 |
Values
| HEX | #42318B |
| RGB | rgb(66, 49, 139) |
| HSL | hsl(251, 48%, 37%) |
| OKLCH | oklch(38.7% 0.143 286.4) |
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 #42318B | 10.27:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #42318B | 2.04:1 | Fails | Lc 10.5 | Not readable |
| #42318B text on white | 10.27:1 | AAA | Lc 93.4 | Preferred for body text |
| #42318B text on black | 2.04:1 | Fails | Lc -9.1 | 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 900.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E8E7FE
oklch(93.6% 0.031 287.8)
-
Step 200
200
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BBB7FF
oklch(80.9% 0.101 286.5)
-
Step 400
400
#9A8EFF
oklch(70.6% 0.161 286.3)
-
Step 500
500
#856CFF
oklch(63.1% 0.209 286.6)
-
Step 600
600
#714AF4
oklch(55.6% 0.238 286.3)
-
Step 700
700
#5F39D4
oklch(49% 0.221 286.2)
-
Step 800
800
#4D31AC
oklch(42.7% 0.184 286.1)
-
Step 900
900 (this color)
#42318B
oklch(38.7% 0.143 286.4)
-
Step 950
950
#251C4F
oklch(27% 0.09 286.9)
#42318B 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) | #00438E | 0.073 |
| Deuteranopia (no green cones) | #003E89 | 0.070 |
| Tritanopia (no blue cones) | #274759 | 0.119 |
| Achromatopsia (no color) | #414141 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42318B
#42318B
oklch(38.7% 0.143 286.4)
- #4A4700
#4A4700
oklch(38.8% 0.083 106.9)
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 #42318B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.043
- Imperial Purple #480CA8 ΔE 0.068
- Cobalt #1E488F ΔE 0.068
- Sapphire #2138AB ΔE 0.070
- Rebecca Purple #663399 ΔE 0.072
- Indigo #4B0082 ΔE 0.074
- Indigo Blue #3A18B1 ΔE 0.075
Use #42318B 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.