#423F55
Closest named color: Charcoal Grey (#3C4142). oklch(38% 0.037 290.8), rgb(66, 63, 85).
Aa
White text reads best on this color (10.12:1).
About this color
#423F55 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.037 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.038 away. White text reads best on it, at 10.12:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.037) |
| Temperature | in between |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #423F55 |
| RGB | rgb(66, 63, 85) |
| HSL | hsl(248, 15%, 29%) |
| OKLCH | oklch(38% 0.037 290.8) |
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 #423F55 | 10.12:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #423F55 | 2.07:1 | Fails | Lc 10.4 | Not readable |
| #423F55 text on white | 10.12:1 | AAA | Lc 93.5 | Preferred for body text |
| #423F55 text on black | 2.07:1 | Fails | Lc -9.0 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#EAE9EF
oklch(93.7% 0.008 293.9)
-
Step 200
200
#D9D8E3
oklch(88.6% 0.015 290.3)
-
Step 300
300
#C0BED2
oklch(80.9% 0.028 290.4)
-
Step 400
400
#A09CBB
oklch(70.7% 0.045 291.1)
-
Step 500
500
#8984AA
oklch(63.1% 0.057 290.7)
-
Step 600
600
#736D95
oklch(55.6% 0.062 291.1)
-
Step 700
700
#605B7F
oklch(49% 0.057 290.5)
-
Step 800
800
#4F4B68
oklch(42.9% 0.048 290.6)
-
Step 900
900 (this color)
#423F55
oklch(38% 0.037 290.8)
-
Step 950
950
#262531
oklch(27.1% 0.022 288.6)
#423F55 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) | #3A4256 | 0.015 |
| Deuteranopia (no green cones) | #3A4154 | 0.014 |
| Tritanopia (no blue cones) | #3E4347 | 0.032 |
| Achromatopsia (no color) | #424242 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423F55
#423F55
oklch(38% 0.037 290.8)
- #43442D
#43442D
oklch(37.9% 0.037 110.1)
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 #423F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.044
- Onyx #343A40 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.056
- Dark Slate Gray #2F4F4F ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.067
- Gunmetal #293241 ΔE 0.067
Use #423F55 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.