#423F7B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.099 283.3), rgb(66, 63, 123).
Aa
White text reads best on this color (9.42:1).
About this color
#423F7B is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 9.42:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #423F7B |
| RGB | rgb(66, 63, 123) |
| HSL | hsl(243, 32%, 36%) |
| OKLCH | oklch(40.2% 0.099 283.3) |
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 #423F7B | 9.42:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #423F7B | 2.22:1 | Fails | Lc 12.3 | Not readable |
| #423F7B text on white | 9.42:1 | AAA | Lc 91.6 | Preferred for body text |
| #423F7B text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F8
oklch(93.5% 0.022 283.1)
-
Step 200
200
#D5D6F4
oklch(88.5% 0.041 284)
-
Step 300
300
#B9BBF0
oklch(80.9% 0.075 282.9)
-
Step 400
400
#9796E8
oklch(70.7% 0.119 283.5)
-
Step 500
500
#7F7AE1
oklch(63.1% 0.151 283.4)
-
Step 600
600
#6961CF
oklch(55.7% 0.164 282.9)
-
Step 700
700
#584FB3
oklch(49.1% 0.153 283.2)
-
Step 800
800
#484191
oklch(42.6% 0.128 283.5)
-
Step 900
900 (this color)
#423F7B
oklch(40.2% 0.099 283.3)
-
Step 950
950
#232144
oklch(27% 0.064 283.9)
#423F7B 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) | #27487D | 0.041 |
| Deuteranopia (no green cones) | #24447A | 0.041 |
| Tritanopia (no blue cones) | #304B57 | 0.083 |
| Achromatopsia (no color) | #464646 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F7B
#423F7B
oklch(40.2% 0.099 283.3)
- #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 #423F7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.045
- Cobalt #1E488F ΔE 0.054
- Twilight #4E518B ΔE 0.059
- Twilight Blue #0A437A ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.064
- Dusk #4E5481 ΔE 0.065
Use #423F7B 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.