#423F82
Closest named color: Dark Slate Blue (#483D8B). oklch(40.7% 0.109 282.4), rgb(66, 63, 130).
Aa
White text reads best on this color (9.27:1).
About this color
#423F82 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.109 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.019 away. White text reads best on it, at 9.27:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #423F82 |
| RGB | rgb(66, 63, 130) |
| HSL | hsl(243, 35%, 38%) |
| OKLCH | oklch(40.7% 0.109 282.4) |
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 #423F82 | 9.27:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #423F82 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #423F82 text on white | 9.27:1 | AAA | Lc 91.2 | Preferred for body text |
| #423F82 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#BABCEA
oklch(80.9% 0.065 282.9)
-
Step 400
400
#9798DF
oklch(70.6% 0.103 282.8)
-
Step 500
500
#7E7ED6
oklch(63.2% 0.131 282)
-
Step 600
600
#6965C3
oklch(55.6% 0.142 282.7)
-
Step 700
700
#5754A8
oklch(49.1% 0.131 282.1)
-
Step 800
800 (this color)
#423F82
oklch(40.7% 0.109 282.4)
-
Step 900
900
#3B3A6D
oklch(37.6% 0.086 282.3)
-
Step 950
950
#232340
oklch(27.2% 0.053 282.3)
#423F82 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) | #214984 | 0.046 |
| Deuteranopia (no green cones) | #1C4581 | 0.047 |
| Tritanopia (no blue cones) | #2C4D5A | 0.093 |
| Achromatopsia (no color) | #474747 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F82
#423F82
oklch(40.7% 0.109 282.4)
- #534B00
#534B00
oklch(40.8% 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 #423F82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.019
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.049
- Twilight #4E518B ΔE 0.056
- Dusk Blue #26538D ΔE 0.061
- Twilight Blue #0A437A ΔE 0.061
- Light Navy #155084 ΔE 0.062
- Dusk #4E5481 ΔE 0.065
Use #423F82 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.