#423779
Closest named color: Dark Slate Blue (#483D8B). oklch(38.4% 0.108 287.9), rgb(66, 55, 121).
Aa
White text reads best on this color (10.22:1).
About this color
#423779 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 10.22:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #423779 |
| RGB | rgb(66, 55, 121) |
| HSL | hsl(250, 37%, 35%) |
| OKLCH | oklch(38.4% 0.108 287.9) |
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 #423779 | 10.22:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #423779 | 2.05:1 | Fails | Lc 10.4 | Not readable |
| #423779 text on white | 10.22:1 | AAA | Lc 93.5 | Preferred for body text |
| #423779 text on black | 2.05:1 | Fails | Lc -9.0 | 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
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D7D5F6
oklch(88.5% 0.045 288.2)
-
Step 300
300
#BDB9F3
oklch(80.9% 0.081 287.6)
-
Step 400
400
#9D92ED
oklch(70.6% 0.131 288.1)
-
Step 500
500
#8775E7
oklch(63.2% 0.166 287.9)
-
Step 600
600
#725AD5
oklch(55.6% 0.181 288)
-
Step 700
700
#6049B8
oklch(49.1% 0.168 288.2)
-
Step 800
800
#4E3D95
oklch(42.7% 0.138 288)
-
Step 900
900 (this color)
#423779
oklch(38.4% 0.108 287.9)
-
Step 950
950
#252046
oklch(27.1% 0.069 286.9)
#423779 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) | #18427B | 0.057 |
| Deuteranopia (no green cones) | #183F78 | 0.056 |
| Tritanopia (no blue cones) | #314552 | 0.091 |
| Achromatopsia (no color) | #414141 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423779
#423779
oklch(38.4% 0.108 287.9)
- #484600
#484600
oklch(38.4% 0.083 107.9)
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 #423779, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.065
- Cobalt #1E488F ΔE 0.066
- Twilight #4E518B ΔE 0.078
- Marine Blue #01386A ΔE 0.078
- Light Navy #155084 ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.082
Use #423779 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.