#423F73
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.086 284.4), rgb(66, 63, 115).
Aa
White text reads best on this color (9.58:1).
About this color
#423F73 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.086 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 9.58:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #423F73 |
| RGB | rgb(66, 63, 115) |
| HSL | hsl(243, 29%, 35%) |
| OKLCH | oklch(39.6% 0.086 284.4) |
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 #423F73 | 9.58:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #423F73 | 2.19:1 | Fails | Lc 11.8 | Not readable |
| #423F73 text on white | 9.58:1 | AAA | Lc 92.1 | Preferred for body text |
| #423F73 text on black | 2.19:1 | Fails | Lc -10.3 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D6F1
oklch(88.4% 0.037 285.6)
-
Step 300
300
#BBBCEA
oklch(81% 0.065 283.9)
-
Step 400
400
#9998DF
oklch(70.8% 0.103 284.1)
-
Step 500
500
#817CD6
oklch(63% 0.133 284.4)
-
Step 600
600
#6C64C3
oklch(55.7% 0.143 284.5)
-
Step 700
700
#5A52A8
oklch(49% 0.133 284.6)
-
Step 800
800
#494488
oklch(42.7% 0.11 284.1)
-
Step 900
900 (this color)
#423F73
oklch(39.6% 0.086 284.4)
-
Step 950
950
#242240
oklch(27% 0.055 285.1)
#423F73 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) | #2C4775 | 0.036 |
| Deuteranopia (no green cones) | #2B4372 | 0.034 |
| Tritanopia (no blue cones) | #344953 | 0.073 |
| Achromatopsia (no color) | #454545 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F73
#423F73
oklch(39.6% 0.086 284.4)
- #4E4800
#4E4800
oklch(39.5% 0.083 104.1)
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 #423F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.059
- Cobalt #1E488F ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.062
- Twilight #4E518B ΔE 0.064
- Light Navy #155084 ΔE 0.065
- Dusk #4E5481 ΔE 0.066
Use #423F73 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.