#423E81
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.109 283), rgb(66, 62, 129).
Aa
White text reads best on this color (9.38:1).
About this color
#423E81 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.109 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.020 away. White text reads best on it, at 9.38:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.38:1 |
Values
| HEX | #423E81 |
| RGB | rgb(66, 62, 129) |
| HSL | hsl(244, 35%, 37%) |
| OKLCH | oklch(40.4% 0.109 283) |
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 #423E81 | 9.38:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #423E81 | 2.23:1 | Fails | Lc 12.5 | Not readable |
| #423E81 text on white | 9.38:1 | AAA | Lc 91.5 | Preferred for body text |
| #423E81 text on black | 2.23:1 | Fails | Lc -10.9 | 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 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7F1
oklch(88.6% 0.036 282.1)
-
Step 300
300
#BABCE9
oklch(80.9% 0.063 282.9)
-
Step 400
400
#9898DF
oklch(70.7% 0.103 283.5)
-
Step 500
500
#7F7DD5
oklch(63% 0.13 283)
-
Step 600
600
#6A65C3
oklch(55.7% 0.142 283.2)
-
Step 700
700
#5853A8
oklch(49% 0.132 283)
-
Step 800
800 (this color)
#423E81
oklch(40.4% 0.109 283)
-
Step 900
900
#3C3A6D
oklch(37.7% 0.086 283.3)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#423E81 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) | #1F4983 | 0.049 |
| Deuteranopia (no green cones) | #1C4480 | 0.048 |
| Tritanopia (no blue cones) | #2C4C59 | 0.093 |
| Achromatopsia (no color) | #464646 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423E81
#423E81
oklch(40.4% 0.109 283)
- #514A00
#514A00
oklch(40.3% 0.085 103.3)
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 #423E81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.020
- Blueberry #464196 ΔE 0.036
- Cobalt #1E488F ΔE 0.051
- Twilight #4E518B ΔE 0.058
- Twilight Blue #0A437A ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Light Navy #155084 ΔE 0.064
- Dusk #4E5481 ΔE 0.068
Use #423E81 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.