#3F303B
Closest named color: Onyx (#343A40). oklch(33% 0.028 336), rgb(63, 48, 59).
Aa
White text reads best on this color (12.37:1).
About this color
#3F303B is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.034 away. White text reads best on it, at 12.37:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.69:1 |
| White text | 12.37:1 |
Values
| HEX | #3F303B |
| RGB | rgb(63, 48, 59) |
| HSL | hsl(316, 14%, 22%) |
| OKLCH | oklch(33% 0.028 336) |
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 #3F303B | 12.37:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #3F303B | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #3F303B text on white | 12.37:1 | AAA | Lc 98.2 | Preferred for body text |
| #3F303B text on black | 1.69:1 | 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
#F7F5F6
oklch(97.2% 0.002 345.2)
-
Step 100
100
#EDE8EB
oklch(93.6% 0.007 340.4)
-
Step 200
200
#DED6DC
oklch(88.4% 0.012 334.1)
-
Step 300
300
#CABCC6
oklch(81% 0.021 335.8)
-
Step 400
400
#AF99A9
oklch(70.7% 0.034 335.6)
-
Step 500
500
#9B8094
oklch(63.1% 0.044 335.4)
-
Step 600
600
#86697E
oklch(55.6% 0.048 336.4)
-
Step 700
700
#71576A
oklch(49% 0.044 336.1)
-
Step 800
800
#5C4857
oklch(42.8% 0.036 335.2)
-
Step 900
900 (this color)
#3F303B
oklch(33% 0.028 336)
-
Step 950
950
#2C232A
oklch(26.9% 0.018 333.9)
#3F303B 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) | #30333B | 0.028 |
| Deuteranopia (no green cones) | #34353B | 0.024 |
| Tritanopia (no blue cones) | #413034 | 0.013 |
| Achromatopsia (no color) | #343434 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F303B
#3F303B
oklch(33% 0.028 336)
- #2A3A2F
#2A3A2F
oklch(33.1% 0.029 154.6)
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 #3F303B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.034
- Gunmetal #293241 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.068
- Midnight Green #073B4C ΔE 0.073
- Jet #212529 ΔE 0.074
Use #3F303B 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.