#42404D
Closest named color: Charcoal Grey (#3C4142). oklch(37.9% 0.022 292.4), rgb(66, 64, 77).
Aa
White text reads best on this color (10.13:1).
About this color
#42404D is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.023 away. White text reads best on it, at 10.13:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.13:1 |
Values
| HEX | #42404D |
| RGB | rgb(66, 64, 77) |
| HSL | hsl(249, 9%, 28%) |
| OKLCH | oklch(37.9% 0.022 292.4) |
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 #42404D | 10.13:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #42404D | 2.07:1 | Fails | Lc 10.4 | Not readable |
| #42404D text on white | 10.13:1 | AAA | Lc 93.5 | Preferred for body text |
| #42404D 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
#A19EB0
oklch(70.8% 0.026 293.4)
-
Step 500
500
#8A869D
oklch(63.1% 0.034 293.4)
-
Step 600
600
#737088
oklch(55.6% 0.037 290.9)
-
Step 700
700
#615D73
oklch(49% 0.035 293.4)
-
Step 800
800
#4F4C5E
oklch(42.6% 0.03 292.7)
-
Step 900
900 (this color)
#42404D
oklch(37.9% 0.022 292.4)
-
Step 950
950
#26252D
oklch(26.9% 0.015 291.1)
#42404D 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) | #3D424E | 0.009 |
| Deuteranopia (no green cones) | #3D414D | 0.008 |
| Tritanopia (no blue cones) | #404244 | 0.019 |
| Achromatopsia (no color) | #414141 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42404D
#42404D
oklch(37.9% 0.022 292.4)
- #424336
#424336
oklch(37.8% 0.021 111)
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 #42404D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.023
- Onyx #343A40 ΔE 0.037
- 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 #42404D 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.