#423579
Closest named color: Dark Slate Blue (#483D8B). oklch(38% 0.111 288.8), rgb(66, 53, 121).
Aa
White text reads best on this color (10.41:1).
About this color
#423579 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.111 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.41:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.01:1 |
| White text | 10.41:1 |
Values
| HEX | #423579 |
| RGB | rgb(66, 53, 121) |
| HSL | hsl(251, 39%, 34%) |
| OKLCH | oklch(38% 0.111 288.8) |
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 #423579 | 10.41:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #423579 | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #423579 text on white | 10.41:1 | AAA | Lc 93.9 | Preferred for body text |
| #423579 text on black | 2.01:1 | Fails | Lc -8.6 | 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 900.
-
Step 50
50
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E8FA
oklch(93.7% 0.024 288.5)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BEB8F4
oklch(80.8% 0.084 288.9)
-
Step 400
400
#9E91EE
oklch(70.6% 0.134 288.9)
-
Step 500
500
#8873E9
oklch(63.1% 0.171 288.7)
-
Step 600
600
#7358D7
oklch(55.5% 0.186 288.6)
-
Step 700
700
#6147BA
oklch(49% 0.173 288.8)
-
Step 800
800
#4F3B97
oklch(42.6% 0.144 288.8)
-
Step 900
900 (this color)
#423579
oklch(38% 0.111 288.8)
-
Step 950
950
#261F46
oklch(27% 0.07 289.1)
#423579 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) | #13417B | 0.062 |
| Deuteranopia (no green cones) | #143E77 | 0.061 |
| Tritanopia (no blue cones) | #324451 | 0.093 |
| Achromatopsia (no color) | #404040 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423579
#423579
oklch(38% 0.111 288.8)
- #464500
#464500
oklch(37.9% 0.082 108.8)
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 #423579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.068
- Cobalt #1E488F ΔE 0.069
- Marine Blue #01386A ΔE 0.079
- Twilight #4E518B ΔE 0.083
- Prussian Blue #1D3557 ΔE 0.083
- Light Navy #155084 ΔE 0.084
Use #423579 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.