#3F3A42
Closest named color: Onyx (#343A40). oklch(35.7% 0.015 313), rgb(63, 58, 66).
Aa
White text reads best on this color (11.08:1).
About this color
#3F3A42 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.019 away. White text reads best on it, at 11.08:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.89:1 |
| White text | 11.08:1 |
Values
| HEX | #3F3A42 |
| RGB | rgb(63, 58, 66) |
| HSL | hsl(278, 6%, 24%) |
| OKLCH | oklch(35.7% 0.015 313) |
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 #3F3A42 | 11.08:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #3F3A42 | 1.89:1 | Fails | Lc 8.2 | Not readable |
| #3F3A42 text on white | 11.08:1 | AAA | Lc 95.6 | Preferred for body text |
| #3F3A42 text on black | 1.89:1 | Fails | Lc 0.0 | 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
#F6F5F6
oklch(97.1% 0.002 325.6)
-
Step 100
100
#EAE9EB
oklch(93.5% 0.003 308.4)
-
Step 200
200
#DAD8DC
oklch(88.5% 0.006 308.4)
-
Step 300
300
#C3BFC6
oklch(81% 0.011 311.2)
-
Step 400
400
#A59DA9
oklch(70.7% 0.019 314.7)
-
Step 500
500
#8E8694
oklch(63.2% 0.023 311)
-
Step 600
600
#796F7E
oklch(55.6% 0.026 314.6)
-
Step 700
700
#655D6A
oklch(49% 0.023 312.6)
-
Step 800
800
#534C57
oklch(42.7% 0.02 313.4)
-
Step 900
900 (this color)
#3F3A42
oklch(35.7% 0.015 313)
-
Step 950
950
#28252A
oklch(27% 0.01 312.1)
#3F3A42 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) | #393B42 | 0.010 |
| Deuteranopia (no green cones) | #3A3C42 | 0.010 |
| Tritanopia (no blue cones) | #3F3B3D | 0.010 |
| Achromatopsia (no color) | #3C3C3C | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3A42
#3F3A42
oklch(35.7% 0.015 313)
- #393E36
#393E36
oklch(35.6% 0.015 133.6)
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 #3F3A42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.019
- Charcoal Grey #3C4142 ΔE 0.023
- Gunmetal #293241 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.048
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.058
- Dark Slate Gray #2F4F4F ΔE 0.066
Use #3F3A42 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.