#42404E
Closest named color: Charcoal Grey (#3C4142). oklch(37.9% 0.024 291.8), rgb(66, 64, 78).
Aa
White text reads best on this color (10.12:1).
About this color
#42404E is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.025 away. White text reads best on it, at 10.12:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #42404E |
| RGB | rgb(66, 64, 78) |
| HSL | hsl(249, 10%, 28%) |
| OKLCH | oklch(37.9% 0.024 291.8) |
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 #42404E | 10.12:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #42404E | 2.07:1 | Fails | Lc 10.4 | Not readable |
| #42404E text on white | 10.12:1 | AAA | Lc 93.5 | Preferred for body text |
| #42404E 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#D9D8DF
oklch(88.5% 0.01 292.8)
-
Step 300
300
#C0BFCB
oklch(80.9% 0.017 289.9)
-
Step 400
400
#A09EB1
oklch(70.7% 0.027 290.5)
-
Step 500
500
#89869E
oklch(63.1% 0.036 291.1)
-
Step 600
600
#736F89
oklch(55.5% 0.04 292.1)
-
Step 700
700
#615D74
oklch(49.1% 0.037 293)
-
Step 800
800
#4F4C5F
oklch(42.7% 0.031 292.3)
-
Step 900
900 (this color)
#42404E
oklch(37.9% 0.024 291.8)
-
Step 950
950
#26252D
oklch(26.9% 0.015 291.1)
#42404E 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) | #3D424F | 0.009 |
| Deuteranopia (no green cones) | #3D414E | 0.008 |
| Tritanopia (no blue cones) | #404245 | 0.019 |
| Achromatopsia (no color) | #424242 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42404E
#42404E
oklch(37.9% 0.024 291.8)
- #424435
#424435
oklch(38% 0.025 113.8)
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 #42404E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.025
- Onyx #343A40 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.055
- Gunmetal #293241 ΔE 0.065
- Purple Brown #673A3F ΔE 0.070
Use #42404E 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.