#3F4E42
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.7% 0.028 150.9), rgb(63, 78, 66).
Aa
White text reads best on this color (8.82:1).
About this color
#3F4E42 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 8.82:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.37:1 |
| White text | 8.82:1 |
Values
| HEX | #3F4E42 |
| RGB | rgb(63, 78, 66) |
| HSL | hsl(132, 11%, 28%) |
| OKLCH | oklch(40.7% 0.028 150.9) |
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 #3F4E42 | 8.82:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #3F4E42 | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #3F4E42 text on white | 8.82:1 | AAA | Lc 90.2 | Preferred for body text |
| #3F4E42 text on black | 2.37:1 | Fails | Lc -12.1 | 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 800.
-
Step 50
50
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D5DBD6
oklch(88.5% 0.009 150.7)
-
Step 300
300
#BAC4BB
oklch(81% 0.017 148.4)
-
Step 400
400
#96A599
oklch(70.7% 0.024 151.5)
-
Step 500
500
#7C8F7F
oklch(63% 0.032 149.8)
-
Step 600
600
#657A69
oklch(55.7% 0.036 150.7)
-
Step 700
700
#536657
oklch(49% 0.033 151.3)
-
Step 800
800 (this color)
#3F4E42
oklch(40.7% 0.028 150.9)
-
Step 900
900
#3A453C
oklch(37.7% 0.021 150.5)
-
Step 950
950
#222823
oklch(26.9% 0.013 150.2)
#3F4E42 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) | #4E4B41 | 0.024 |
| Deuteranopia (no green cones) | #4C4A43 | 0.023 |
| Tritanopia (no blue cones) | #3D4D4B | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E42
#3F4E42
oklch(40.7% 0.028 150.9)
- #534451
#534451
oklch(40.7% 0.029 330.5)
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 #3F4E42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.044
- Dark Blue Green #005249 ΔE 0.051
- Charcoal #264653 ΔE 0.055
- Dark Teal #014D4E ΔE 0.056
- Deep Teal #00555A ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.063
- Pine #2B5D34 ΔE 0.064
Use #3F4E42 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.