#3F433F
Closest named color: Charcoal Grey (#3C4142). oklch(37.8% 0.009 145.4), rgb(63, 67, 63).
Aa
White text reads best on this color (10.06:1).
About this color
#3F433F is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.009. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.011 away. White text reads best on it, at 10.06:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.009) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.08:1 |
| White text | 10.06:1 |
Values
| HEX | #3F433F |
| RGB | rgb(63, 67, 63) |
| HSL | hsl(120, 3%, 25%) |
| OKLCH | oklch(37.8% 0.009 145.4) |
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 #3F433F | 10.06:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #3F433F | 2.08:1 | Fails | Lc 10.5 | Not readable |
| #3F433F text on white | 10.06:1 | AAA | Lc 93.4 | Preferred for body text |
| #3F433F text on black | 2.08:1 | Fails | Lc -9.1 | 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 900.
-
Step 50
50
#F5F5F5
oklch(97% 0 0)
-
Step 100
100
#E9EAE9
oklch(93.6% 0.002 145.6)
-
Step 200
200
#D8DAD8
oklch(88.6% 0.003 145.5)
-
Step 300
300
#BEC2BE
oklch(81% 0.007 145.5)
-
Step 400
400
#9DA29D
oklch(70.7% 0.009 145.5)
-
Step 500
500
#858C85
oklch(63.2% 0.013 145.4)
-
Step 600
600
#6E766E
oklch(55.7% 0.016 145.4)
-
Step 700
700
#5C635C
oklch(49.1% 0.014 145.4)
-
Step 800
800
#4B514B
oklch(42.8% 0.012 145.4)
-
Step 900
900 (this color)
#3F433F
oklch(37.8% 0.009 145.4)
-
Step 950
950
#252725
oklch(27% 0.005 145.4)
#3F433F 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) | #43423F | 0.007 |
| Deuteranopia (no green cones) | #42423F | 0.006 |
| Tritanopia (no blue cones) | #3F4342 | 0.005 |
| Achromatopsia (no color) | #424242 | 0.009 |
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 #3F433F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.011
- Onyx #343A40 ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.041
- Charcoal #264653 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.052
- Dark Teal #014D4E ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Blue Green #005249 ΔE 0.066
Use #3F433F 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.