#42404A
Closest named color: Charcoal Grey (#3C4142). oklch(37.7% 0.017 294.7), rgb(66, 64, 74).
Aa
White text reads best on this color (10.17:1).
About this color
#42404A is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.019 away. White text reads best on it, at 10.17:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #42404A |
| RGB | rgb(66, 64, 74) |
| HSL | hsl(252, 7%, 27%) |
| OKLCH | oklch(37.7% 0.017 294.7) |
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 #42404A | 10.17:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #42404A | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #42404A text on white | 10.17:1 | AAA | Lc 93.6 | Preferred for body text |
| #42404A 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#D9D8DD
oklch(88.4% 0.007 295.4)
-
Step 300
300
#C1BFC8
oklch(80.9% 0.013 296.3)
-
Step 400
400
#A19EAC
oklch(70.6% 0.02 295.7)
-
Step 500
500
#8A8798
oklch(63.2% 0.025 293.8)
-
Step 600
600
#747083
oklch(55.5% 0.029 295.1)
-
Step 700
700
#615E6F
oklch(49.1% 0.027 293.5)
-
Step 800
800
#4F4D5A
oklch(42.7% 0.021 292.5)
-
Step 900
900 (this color)
#42404A
oklch(37.7% 0.017 294.7)
-
Step 950
950
#27252B
oklch(26.9% 0.011 300.8)
#42404A 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) | #3E414A | 0.007 |
| Deuteranopia (no green cones) | #3E414A | 0.007 |
| Tritanopia (no blue cones) | #414143 | 0.014 |
| Achromatopsia (no color) | #414141 | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42404A
#42404A
oklch(37.7% 0.017 294.7)
- #414339
#414339
oklch(37.8% 0.017 116.4)
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 #42404A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.019
- Onyx #343A40 ΔE 0.034
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
- Dark Slate Gray #2F4F4F ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.055
- Gunmetal #293241 ΔE 0.065
- Purple Brown #673A3F ΔE 0.069
Use #42404A 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.