#42357E
Closest named color: Dark Slate Blue (#483D8B). oklch(38.4% 0.119 287.6), rgb(66, 53, 126).
Aa
White text reads best on this color (10.28:1).
About this color
#42357E is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.119 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.031 away. White text reads best on it, at 10.28:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #42357E |
| RGB | rgb(66, 53, 126) |
| HSL | hsl(251, 41%, 35%) |
| OKLCH | oklch(38.4% 0.119 287.6) |
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 #42357E | 10.28:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #42357E | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #42357E text on white | 10.28:1 | AAA | Lc 93.6 | Preferred for body text |
| #42357E text on black | 2.04:1 | Fails | Lc -8.9 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D7D5F9
oklch(88.6% 0.049 287.9)
-
Step 300
300
#BDB8F8
oklch(80.9% 0.09 287.8)
-
Step 400
400
#9C91F4
oklch(70.7% 0.142 287.3)
-
Step 500
500
#8672EF
oklch(63.1% 0.181 287.4)
-
Step 600
600
#7256DE
oklch(55.6% 0.198 287.6)
-
Step 700
700
#6045C1
oklch(49.1% 0.184 287.6)
-
Step 800
800
#4E3A9C
oklch(42.8% 0.152 287.5)
-
Step 900
900 (this color)
#42357E
oklch(38.4% 0.119 287.6)
-
Step 950
950
#251F49
oklch(27.1% 0.075 286.8)
#42357E 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) | #0A4280 | 0.066 |
| Deuteranopia (no green cones) | #0A3F7C | 0.066 |
| Tritanopia (no blue cones) | #2F4554 | 0.098 |
| Achromatopsia (no color) | #414141 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42357E
#42357E
oklch(38.4% 0.119 287.6)
- #484600
#484600
oklch(38.4% 0.083 107.9)
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 #42357E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.031
- Blueberry #464196 ΔE 0.049
- Cobalt #1E488F ΔE 0.066
- Twilight Blue #0A437A ΔE 0.069
- Rebecca Purple #663399 ΔE 0.079
- Twilight #4E518B ΔE 0.081
- Marine Blue #01386A ΔE 0.082
- Light Navy #155084 ΔE 0.083
Use #42357E 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.