#423F51
Closest named color: Charcoal Grey (#3C4142). oklch(37.8% 0.031 292.5), rgb(66, 63, 81).
Aa
White text reads best on this color (10.18:1).
About this color
#423F51 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.031 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.031 away. White text reads best on it, at 10.18:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.031) |
| Temperature | in between |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.06:1 |
| White text | 10.18:1 |
Values
| HEX | #423F51 |
| RGB | rgb(66, 63, 81) |
| HSL | hsl(250, 12%, 28%) |
| OKLCH | oklch(37.8% 0.031 292.5) |
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 #423F51 | 10.18:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #423F51 | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #423F51 text on white | 10.18:1 | AAA | Lc 93.7 | Preferred for body text |
| #423F51 text on black | 2.06:1 | Fails | Lc -8.9 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#EAE9EE
oklch(93.6% 0.007 295.4)
-
Step 200
200
#D9D8E1
oklch(88.6% 0.012 291.3)
-
Step 300
300
#C1BECF
oklch(80.9% 0.024 294)
-
Step 400
400
#A19DB6
oklch(70.8% 0.036 292.8)
-
Step 500
500
#8A85A4
oklch(63.2% 0.046 292.4)
-
Step 600
600
#746E8F
oklch(55.6% 0.051 293)
-
Step 700
700
#615C7A
oklch(49.1% 0.048 292.2)
-
Step 800
800
#4F4B63
oklch(42.6% 0.04 292.3)
-
Step 900
900 (this color)
#423F51
oklch(37.8% 0.031 292.5)
-
Step 950
950
#27252F
oklch(27.1% 0.019 294.3)
#423F51 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) | #3B4152 | 0.012 |
| Deuteranopia (no green cones) | #3B4150 | 0.013 |
| Tritanopia (no blue cones) | #3F4245 | 0.026 |
| Achromatopsia (no color) | #414141 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F51
#423F51
oklch(37.8% 0.031 292.5)
- #424431
#424431
oklch(37.9% 0.031 112.8)
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 #423F51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.039
- Onyx #343A40 ΔE 0.040
- Charcoal #264653 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.057
- Gunmetal #293241 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.068
Use #423F51 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.