#42396D
Closest named color: Dark Slate Blue (#483D8B). oklch(38% 0.087 289.6), rgb(66, 57, 109).
Aa
White text reads best on this color (10.30:1).
About this color
#42396D is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.087 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.052 away. White text reads best on it, at 10.30:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.03:1 |
| White text | 10.30:1 |
Values
| HEX | #42396D |
| RGB | rgb(66, 57, 109) |
| HSL | hsl(250, 31%, 33%) |
| OKLCH | oklch(38% 0.087 289.6) |
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 #42396D | 10.30:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #42396D | 2.03:1 | Fails | Lc 10.1 | Not readable |
| #42396D text on white | 10.30:1 | AAA | Lc 93.8 | Preferred for body text |
| #42396D text on black | 2.03:1 | Fails | Lc -8.7 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D8D6F0
oklch(88.6% 0.036 289.2)
-
Step 300
300
#BFBAE9
oklch(80.9% 0.066 289.7)
-
Step 400
400
#9F95DD
oklch(70.6% 0.104 289.8)
-
Step 500
500
#897AD4
oklch(63.2% 0.133 289.7)
-
Step 600
600
#7361C1
oklch(55.6% 0.144 289.5)
-
Step 700
700
#6150A7
oklch(49.2% 0.134 289.5)
-
Step 800
800
#4F4287
oklch(42.8% 0.111 289.5)
-
Step 900
900 (this color)
#42396D
oklch(38% 0.087 289.6)
-
Step 950
950
#26213F
oklch(26.9% 0.055 289.9)
#42396D 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) | #27416F | 0.042 |
| Deuteranopia (no green cones) | #273F6C | 0.042 |
| Tritanopia (no blue cones) | #37434D | 0.073 |
| Achromatopsia (no color) | #404040 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42396D
#42396D
oklch(38% 0.087 289.6)
- #464600
#464600
oklch(38.2% 0.083 109.8)
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 #42396D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.052
- Twilight Blue #0A437A ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.070
- Marine Blue #01386A ΔE 0.074
- Cobalt #1E488F ΔE 0.075
- Charcoal #264653 ΔE 0.078
Use #42396D 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.