#423F8A
Closest named color: Dark Slate Blue (#483D8B). oklch(41.2% 0.121 281.5), rgb(66, 63, 138).
Aa
White text reads best on this color (9.09:1).
About this color
#423F8A is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.121 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.011 away. White text reads best on it, at 9.09:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.30:1 |
| White text | 9.09:1 |
Values
| HEX | #423F8A |
| RGB | rgb(66, 63, 138) |
| HSL | hsl(242, 37%, 39%) |
| OKLCH | oklch(41.2% 0.121 281.5) |
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 #423F8A | 9.09:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #423F8A | 2.30:1 | Fails | Lc 13.3 | Not readable |
| #423F8A text on white | 9.09:1 | AAA | Lc 90.7 | Preferred for body text |
| #423F8A text on black | 2.30:1 | Fails | Lc -11.6 | 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
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F3
oklch(88.6% 0.039 280.7)
-
Step 300
300
#B8BCEE
oklch(80.9% 0.071 281.1)
-
Step 400
400
#9598E6
oklch(70.8% 0.113 281.4)
-
Step 500
500
#7C7CDE
oklch(63.1% 0.145 281.4)
-
Step 600
600
#6663CC
oklch(55.6% 0.158 281.2)
-
Step 700
700
#5551B0
oklch(49% 0.147 281.4)
-
Step 800
800 (this color)
#423F8A
oklch(41.2% 0.121 281.5)
-
Step 900
900
#3A3972
oklch(37.6% 0.095 281.6)
-
Step 950
950
#222243
oklch(27% 0.06 281.6)
#423F8A 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) | #174B8D | 0.053 |
| Deuteranopia (no green cones) | #0F4688 | 0.055 |
| Tritanopia (no blue cones) | #26505E | 0.105 |
| Achromatopsia (no color) | #484848 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F8A
#423F8A
oklch(41.2% 0.121 281.5)
- #554C00
#554C00
oklch(41.3% 0.086 101.6)
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 #423F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.011
- Blueberry #464196 ΔE 0.021
- Cobalt #1E488F ΔE 0.046
- Twilight #4E518B ΔE 0.055
- Dusk Blue #26538D ΔE 0.060
- Light Navy #155084 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
- Dusk #4E5481 ΔE 0.068
Use #423F8A 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.