#423F88
Closest named color: Dark Slate Blue (#483D8B). oklch(41.1% 0.118 281.7), rgb(66, 63, 136).
Aa
White text reads best on this color (9.13:1).
About this color
#423F88 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.118 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.012 away. White text reads best on it, at 9.13:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.29:1 |
| White text | 9.13:1 |
Values
| HEX | #423F88 |
| RGB | rgb(66, 63, 136) |
| HSL | hsl(242, 37%, 39%) |
| OKLCH | oklch(41.1% 0.118 281.7) |
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 #423F88 | 9.13:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #423F88 | 2.29:1 | Fails | Lc 13.2 | Not readable |
| #423F88 text on white | 9.13:1 | AAA | Lc 90.8 | Preferred for body text |
| #423F88 text on black | 2.29:1 | Fails | Lc -11.5 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F3
oklch(88.6% 0.039 280.7)
-
Step 300
300
#B9BCED
oklch(81% 0.069 282)
-
Step 400
400
#9598E4
oklch(70.7% 0.111 281.4)
-
Step 500
500
#7D7CDC
oklch(63% 0.142 282)
-
Step 600
600
#6764C9
oklch(55.6% 0.152 281.6)
-
Step 700
700
#5652AE
oklch(49.1% 0.142 281.7)
-
Step 800
800 (this color)
#423F88
oklch(41.1% 0.118 281.7)
-
Step 900
900
#3A3A71
oklch(37.8% 0.092 281)
-
Step 950
950
#222242
oklch(27% 0.059 281.7)
#423F88 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) | #1A4B8B | 0.052 |
| Deuteranopia (no green cones) | #134586 | 0.053 |
| Tritanopia (no blue cones) | #274F5D | 0.102 |
| Achromatopsia (no color) | #484848 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F88
#423F88
oklch(41.1% 0.118 281.7)
- #544C00
#544C00
oklch(41.2% 0.086 102.5)
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 #423F88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.012
- Blueberry #464196 ΔE 0.024
- Cobalt #1E488F ΔE 0.046
- Twilight #4E518B ΔE 0.055
- Dusk Blue #26538D ΔE 0.060
- Light Navy #155084 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.065
- Dusk #4E5481 ΔE 0.067
Use #423F88 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.