#333F40
Closest named color: Charcoal Grey (#3C4142). oklch(35.7% 0.016 202.7), rgb(51, 63, 64).
Aa
White text reads best on this color (10.90:1).
About this color
#333F40 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.016 away. White text reads best on it, at 10.90:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #333F40 |
| RGB | rgb(51, 63, 64) |
| HSL | hsl(185, 11%, 23%) |
| OKLCH | oklch(35.7% 0.016 202.7) |
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 #333F40 | 10.90:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #333F40 | 1.92:1 | Fails | Lc 8.6 | Not readable |
| #333F40 text on white | 10.90:1 | AAA | Lc 95.3 | Preferred for body text |
| #333F40 text on black | 1.92:1 | Fails | Lc -7.4 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D4DADB
oklch(88.4% 0.007 208.8)
-
Step 300
300
#B8C3C4
oklch(80.9% 0.012 203.4)
-
Step 400
400
#94A4A6
oklch(70.7% 0.018 205.8)
-
Step 500
500
#798E90
oklch(63.1% 0.024 203.6)
-
Step 600
600
#62787A
oklch(55.6% 0.026 203.2)
-
Step 700
700
#516567
oklch(49.1% 0.024 203.9)
-
Step 800
800
#425254
oklch(42.6% 0.02 205.7)
-
Step 900
900 (this color)
#333F40
oklch(35.7% 0.016 202.7)
-
Step 950
950
#212829
oklch(27% 0.01 207.1)
#333F40 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) | #3D3E40 | 0.016 |
| Deuteranopia (no green cones) | #3B3C40 | 0.015 |
| Tritanopia (no blue cones) | #2F403F | 0.007 |
| Achromatopsia (no color) | #3D3D3D | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F40
#333F40
oklch(35.7% 0.016 202.7)
- #443939
#443939
oklch(35.6% 0.016 17.9)
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 #333F40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.016
- Onyx #343A40 ΔE 0.017
- Charcoal #264653 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.046
- Gunmetal #293241 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
Use #333F40 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.