#423781
Closest named color: Dark Slate Blue (#483D8B). oklch(39% 0.12 286.2), rgb(66, 55, 129).
Aa
White text reads best on this color (10.02:1).
About this color
#423781 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.120 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.025 away. White text reads best on it, at 10.02:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.02:1 |
Values
| HEX | #423781 |
| RGB | rgb(66, 55, 129) |
| HSL | hsl(249, 40%, 36%) |
| OKLCH | oklch(39% 0.12 286.2) |
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 #423781 | 10.02:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #423781 | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #423781 text on white | 10.02:1 | AAA | Lc 93.0 | Preferred for body text |
| #423781 text on black | 2.09:1 | Fails | Lc -9.5 | 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
#F4F4FD
oklch(97% 0.012 286.2)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D6D5F9
oklch(88.5% 0.049 286.6)
-
Step 300
300
#BBB8F9
oklch(80.8% 0.091 286.3)
-
Step 400
400
#9A91F5
oklch(70.6% 0.144 286.2)
-
Step 500
500
#8472F1
oklch(63.1% 0.184 286.4)
-
Step 600
600
#6F56E0
oklch(55.5% 0.201 286.2)
-
Step 700
700
#5E45C2
oklch(49% 0.186 286.6)
-
Step 800
800
#4C3A9D
oklch(42.7% 0.154 286.3)
-
Step 900
900 (this color)
#423781
oklch(39% 0.12 286.2)
-
Step 950
950
#241F49
oklch(27% 0.075 285.6)
#423781 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) | #0C4484 | 0.064 |
| Deuteranopia (no green cones) | #09407F | 0.064 |
| Tritanopia (no blue cones) | #2D4756 | 0.100 |
| Achromatopsia (no color) | #424242 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423781
#423781
oklch(39% 0.12 286.2)
- #4B4700
#4B4700
oklch(38.9% 0.083 106)
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 #423781, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.025
- Blueberry #464196 ΔE 0.042
- Cobalt #1E488F ΔE 0.061
- Twilight Blue #0A437A ΔE 0.067
- Twilight #4E518B ΔE 0.075
- Rebecca Purple #663399 ΔE 0.076
- Light Navy #155084 ΔE 0.079
- Dusk Blue #26538D ΔE 0.079
Use #423781 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.