#3F3337
Closest named color: Onyx (#343A40). oklch(33.6% 0.018 356.1), rgb(63, 51, 55).
Aa
White text reads best on this color (12.06:1).
About this color
#3F3337 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.028 away. White text reads best on it, at 12.06:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.74:1 |
| White text | 12.06:1 |
Values
| HEX | #3F3337 |
| RGB | rgb(63, 51, 55) |
| HSL | hsl(340, 11%, 22%) |
| OKLCH | oklch(33.6% 0.018 356.1) |
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 #3F3337 | 12.06:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #3F3337 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #3F3337 text on white | 12.06:1 | AAA | Lc 97.6 | Preferred for body text |
| #3F3337 text on black | 1.74:1 | 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
#F6F5F5
oklch(97.1% 0.001 17.2)
-
Step 100
100
#ECE9EA
oklch(93.7% 0.003 354.7)
-
Step 200
200
#DED7D9
oklch(88.5% 0.008 357.8)
-
Step 300
300
#C8BDC1
oklch(80.9% 0.014 353.2)
-
Step 400
400
#AD9BA1
oklch(70.7% 0.023 355.5)
-
Step 500
500
#98838A
oklch(63.1% 0.027 355.8)
-
Step 600
600
#836C74
oklch(55.6% 0.031 355.3)
-
Step 700
700
#6F5A61
oklch(49.1% 0.029 356.2)
-
Step 800
800
#5A4A4F
oklch(42.7% 0.023 357.4)
-
Step 900
900 (this color)
#3F3337
oklch(33.6% 0.018 356.1)
-
Step 950
950
#2B2427
oklch(26.9% 0.012 350.2)
#3F3337 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) | #343537 | 0.020 |
| Deuteranopia (no green cones) | #373737 | 0.018 |
| Tritanopia (no blue cones) | #413334 | 0.006 |
| Achromatopsia (no color) | #363636 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3337
#3F3337
oklch(33.6% 0.018 356.1)
- #2D3A36
#2D3A36
oklch(33.5% 0.019 174.4)
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 #3F3337, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.028
- Gunmetal #293241 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.058
- Charcoal #264653 ΔE 0.070
- Pakistan Green #283618 ΔE 0.071
- Midnight Green #073B4C ΔE 0.072
Use #3F3337 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.