#423F63
Closest named color: Dark Grey Blue (#29465B). oklch(38.7% 0.061 287), rgb(66, 63, 99).
Aa
White text reads best on this color (9.89:1).
About this color
#423F63 is a dark, muted purple. In OKLCH its lightness is 39%, its chroma 0.061 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.045 away. White text reads best on it, at 9.89:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #423F63 |
| RGB | rgb(66, 63, 99) |
| HSL | hsl(245, 22%, 32%) |
| OKLCH | oklch(38.7% 0.061 287) |
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 #423F63 | 9.89:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #423F63 | 2.12:1 | Fails | Lc 11.0 | Not readable |
| #423F63 text on white | 9.89:1 | AAA | Lc 92.9 | Preferred for body text |
| #423F63 text on black | 2.12:1 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F2
oklch(93.7% 0.012 286.2)
-
Step 200
200
#D7D7E9
oklch(88.5% 0.025 285.9)
-
Step 300
300
#BEBDDD
oklch(81% 0.045 286.8)
-
Step 400
400
#9D9ACC
oklch(70.7% 0.073 287.1)
-
Step 500
500
#8681BF
oklch(63.2% 0.092 287.1)
-
Step 600
600
#7069AB
oklch(55.6% 0.101 287.5)
-
Step 700
700
#5D5793
oklch(49% 0.095 286.9)
-
Step 800
800
#4C4877
oklch(42.7% 0.077 286.6)
-
Step 900
900 (this color)
#423F63
oklch(38.7% 0.061 287)
-
Step 950
950
#252338
oklch(26.9% 0.039 287.9)
#423F63 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) | #354464 | 0.023 |
| Deuteranopia (no green cones) | #344262 | 0.023 |
| Tritanopia (no blue cones) | #3A464C | 0.053 |
| Achromatopsia (no color) | #434343 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F63
#423F63
oklch(38.7% 0.061 287)
- #48461D
#48461D
oklch(38.6% 0.06 106.3)
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 #423F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.045
- Charcoal #264653 ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.061
- Onyx #343A40 ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.067
- Twilight Blue #0A437A ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.070
Use #423F63 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.