#423D79
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.099 284.7), rgb(66, 61, 121).
Aa
White text reads best on this color (9.65:1).
About this color
#423D79 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 9.65:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #423D79 |
| RGB | rgb(66, 61, 121) |
| HSL | hsl(245, 33%, 36%) |
| OKLCH | oklch(39.6% 0.099 284.7) |
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 #423D79 | 9.65:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #423D79 | 2.17:1 | Fails | Lc 11.7 | Not readable |
| #423D79 text on white | 9.65:1 | AAA | Lc 92.2 | Preferred for body text |
| #423D79 text on black | 2.17:1 | Fails | Lc -10.2 | 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
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D5D6F4
oklch(88.5% 0.041 284)
-
Step 300
300
#BBBBEF
oklch(81% 0.073 284.7)
-
Step 400
400
#9996E7
oklch(70.8% 0.117 284.7)
-
Step 500
500
#8179E0
oklch(63% 0.151 284.7)
-
Step 600
600
#6C60CE
oklch(55.6% 0.164 284.7)
-
Step 700
700
#5A4EB2
oklch(49% 0.153 284.7)
-
Step 800
800
#4A4190
oklch(42.7% 0.126 284.9)
-
Step 900
900 (this color)
#423D79
oklch(39.6% 0.099 284.7)
-
Step 950
950
#242143
oklch(27% 0.062 285.5)
#423D79 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) | #25467B | 0.043 |
| Deuteranopia (no green cones) | #234378 | 0.043 |
| Tritanopia (no blue cones) | #314955 | 0.083 |
| Achromatopsia (no color) | #454545 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423D79
#423D79
oklch(39.6% 0.099 284.7)
- #4E4900
#4E4900
oklch(39.8% 0.084 105.1)
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 #423D79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.049
- Cobalt #1E488F ΔE 0.058
- Twilight Blue #0A437A ΔE 0.060
- Twilight #4E518B ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Dusk Blue #26538D ΔE 0.069
- Dusk #4E5481 ΔE 0.070
Use #423D79 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.