#423F7C
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.1 283.1), rgb(66, 63, 124).
Aa
White text reads best on this color (9.40:1).
About this color
#423F7C is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 9.40:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #423F7C |
| RGB | rgb(66, 63, 124) |
| HSL | hsl(243, 33%, 37%) |
| OKLCH | oklch(40.2% 0.1 283.1) |
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 #423F7C | 9.40:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #423F7C | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #423F7C text on white | 9.40:1 | AAA | Lc 91.6 | Preferred for body text |
| #423F7C text on black | 2.23:1 | Fails | Lc -10.8 | 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
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BBBCE6
oklch(80.8% 0.059 283.9)
-
Step 400
400
#9899DA
oklch(70.7% 0.094 283)
-
Step 500
500
#807FCF
oklch(63.1% 0.119 283)
-
Step 600
600
#6A67BC
oklch(55.6% 0.129 282.9)
-
Step 700
700
#5955A2
oklch(49.1% 0.12 283.4)
-
Step 800
800 (this color)
#423F7C
oklch(40.2% 0.1 283.1)
-
Step 900
900
#3C3B69
oklch(37.6% 0.078 283)
-
Step 950
950
#23233E
oklch(27% 0.05 282.6)
#423F7C 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) | #26487E | 0.041 |
| Deuteranopia (no green cones) | #23447B | 0.042 |
| Tritanopia (no blue cones) | #2F4C57 | 0.087 |
| Achromatopsia (no color) | #464646 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F7C
#423F7C
oklch(40.2% 0.1 283.1)
- #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 #423F7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.044
- Cobalt #1E488F ΔE 0.053
- Twilight #4E518B ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.063
- Dusk #4E5481 ΔE 0.065
Use #423F7C 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.