#40423F
Closest named color: Charcoal Grey (#3C4142). oklch(37.6% 0.006 134.9), rgb(64, 66, 63).
Aa
White text reads best on this color (10.14:1).
About this color
#40423F is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.006. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.009 away. White text reads best on it, at 10.14:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.006) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.06:1 |
| White text | 10.14:1 |
Values
| HEX | #40423F |
| RGB | rgb(64, 66, 63) |
| HSL | hsl(100, 2%, 25%) |
| OKLCH | oklch(37.6% 0.006 134.9) |
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 #40423F | 10.14:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #40423F | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #40423F text on white | 10.14:1 | AAA | Lc 93.6 | Preferred for body text |
| #40423F 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
#F5F5F5
oklch(97% 0 0)
-
Step 100
100
#E9EAE9
oklch(93.6% 0.002 145.6)
-
Step 200
200
#D8D9D8
oklch(88.4% 0.002 145.6)
-
Step 300
300
#BFC1BE
oklch(80.8% 0.005 134.9)
-
Step 400
400
#9FA19D
oklch(70.6% 0.006 128.6)
-
Step 500
500
#878B85
oklch(63.2% 0.01 134.9)
-
Step 600
600
#71756F
oklch(55.7% 0.01 134.9)
-
Step 700
700
#5F625D
oklch(49.2% 0.009 132.5)
-
Step 800
800
#4D504C
oklch(42.7% 0.008 137.8)
-
Step 900
900 (this color)
#40423F
oklch(37.6% 0.006 134.9)
-
Step 950
950
#262725
oklch(27.1% 0.004 128.6)
#40423F 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) | #42413F | 0.004 |
| Deuteranopia (no green cones) | #42413F | 0.004 |
| Tritanopia (no blue cones) | #404241 | 0.003 |
| Achromatopsia (no color) | #414141 | 0.006 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #40423F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.009
- Onyx #343A40 ΔE 0.035
- Charcoal #264653 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.061
- Dark Teal #014D4E ΔE 0.062
- Dark Blue Green #005249 ΔE 0.069
Use #40423F 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.