#42337F
Closest named color: Dark Slate Blue (#483D8B). oklch(38.1% 0.123 288.2), rgb(66, 51, 127).
Aa
White text reads best on this color (10.43:1).
About this color
#42337F is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.123 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 10.43:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #42337F |
| RGB | rgb(66, 51, 127) |
| HSL | hsl(252, 43%, 35%) |
| OKLCH | oklch(38.1% 0.123 288.2) |
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 #42337F | 10.43:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #42337F | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #42337F text on white | 10.43:1 | AAA | Lc 93.9 | Preferred for body text |
| #42337F text on black | 2.01:1 | Fails | Lc -8.6 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E8E7FB
oklch(93.5% 0.027 288.2)
-
Step 200
200
#D7D4FA
oklch(88.4% 0.052 288.9)
-
Step 300
300
#BDB7F9
oklch(80.8% 0.093 288.3)
-
Step 400
400
#9D8FF6
oklch(70.6% 0.148 288.2)
-
Step 500
500
#8870F3
oklch(63.2% 0.189 288.2)
-
Step 600
600
#7353E1
oklch(55.5% 0.205 288.2)
-
Step 700
700
#6143C4
oklch(49.2% 0.191 288)
-
Step 800
800
#4F389E
oklch(42.7% 0.158 288.2)
-
Step 900
900 (this color)
#42337F
oklch(38.1% 0.123 288.2)
-
Step 950
950
#261E4A
oklch(27.1% 0.079 288.4)
#42337F 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) | #004182 | 0.071 |
| Deuteranopia (no green cones) | #003E7D | 0.071 |
| Tritanopia (no blue cones) | #2F4454 | 0.101 |
| Achromatopsia (no color) | #404040 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42337F
#42337F
oklch(38.1% 0.123 288.2)
- #474500
#474500
oklch(38% 0.082 107.9)
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 #42337F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.051
- Cobalt #1E488F ΔE 0.069
- Twilight Blue #0A437A ΔE 0.072
- Indigo #4B0082 ΔE 0.078
- Rebecca Purple #663399 ΔE 0.079
- Marine Blue #01386A ΔE 0.083
- Sapphire #2138AB ΔE 0.085
Use #42337F 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.