#333F3F
Closest named color: Charcoal Grey (#3C4142). oklch(35.7% 0.016 196.5), rgb(51, 63, 63).
Aa
White text reads best on this color (10.91:1).
About this color
#333F3F 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 0.017 away. White text reads best on it, at 10.91:1.
| 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 | 10.91:1 |
Values
| HEX | #333F3F |
| RGB | rgb(51, 63, 63) |
| HSL | hsl(180, 11%, 22%) |
| OKLCH | oklch(35.7% 0.016 196.5) |
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 #333F3F | 10.91:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #333F3F | 1.92:1 | Fails | Lc 8.6 | Not readable |
| #333F3F text on white | 10.91:1 | AAA | Lc 95.3 | Preferred for body text |
| #333F3F 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
#E7EAEA
oklch(93.5% 0.003 197.1)
-
Step 200
200
#D4DADA
oklch(88.4% 0.007 197)
-
Step 300
300
#B8C3C3
oklch(80.9% 0.012 196.9)
-
Step 400
400
#94A4A4
oklch(70.6% 0.018 196.8)
-
Step 500
500
#798E8E
oklch(63% 0.024 196.6)
-
Step 600
600
#627878
oklch(55.5% 0.026 196.4)
-
Step 700
700
#516565
oklch(49% 0.024 196.4)
-
Step 800
800
#425353
oklch(42.8% 0.021 196.4)
-
Step 900
900 (this color)
#333F3F
oklch(35.7% 0.016 196.5)
-
Step 950
950
#212828
oklch(27% 0.01 196.6)
#333F3F 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) | #3D3E3F | 0.016 |
| Deuteranopia (no green cones) | #3B3C3F | 0.015 |
| Tritanopia (no blue cones) | #2F403F | 0.006 |
| Achromatopsia (no color) | #3D3D3D | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F3F
#333F3F
oklch(35.7% 0.016 196.5)
- #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 #333F3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.017
- Onyx #343A40 ΔE 0.017
- Charcoal #264653 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.047
- Gunmetal #293241 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
Use #333F3F 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.