#423957
Closest named color: Onyx (#343A40). oklch(36.7% 0.052 297.6), rgb(66, 57, 87).
Aa
White text reads best on this color (10.74:1).
About this color
#423957 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.052 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.049 away. White text reads best on it, at 10.74:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.052) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #423957 |
| RGB | rgb(66, 57, 87) |
| HSL | hsl(258, 21%, 28%) |
| OKLCH | oklch(36.7% 0.052 297.6) |
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 #423957 | 10.74:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #423957 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #423957 text on white | 10.74:1 | AAA | Lc 94.9 | Preferred for body text |
| #423957 text on black | 1.95:1 | Fails | Lc -7.7 | 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
#F6F5F9
oklch(97.2% 0.005 297.7)
-
Step 100
100
#EAE8F1
oklch(93.5% 0.012 296.3)
-
Step 200
200
#DAD6E6
oklch(88.4% 0.022 297.4)
-
Step 300
300
#C3BCD7
oklch(80.9% 0.038 297.4)
-
Step 400
400
#A599C3
oklch(70.8% 0.062 297.9)
-
Step 500
500
#8F7FB4
oklch(63.1% 0.08 297.9)
-
Step 600
600
#7968A0
oklch(55.6% 0.087 297.5)
-
Step 700
700
#665689
oklch(49% 0.082 297.7)
-
Step 800
800
#53476F
oklch(42.7% 0.066 297.3)
-
Step 900
900 (this color)
#423957
oklch(36.7% 0.052 297.6)
-
Step 950
950
#282335
oklch(27% 0.034 296.8)
#423957 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) | #323E58 | 0.028 |
| Deuteranopia (no green cones) | #333D56 | 0.027 |
| Tritanopia (no blue cones) | #3E3E44 | 0.042 |
| Achromatopsia (no color) | #3E3E3E | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423957
#423957
oklch(36.7% 0.052 297.6)
- #3D4322
#3D4322
oklch(36.8% 0.052 117.5)
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 #423957, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
- Charcoal Grey #3C4142 ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.056
- Charcoal #264653 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.059
- Gunmetal #293241 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.065
Use #423957 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.