#3F313A
Closest named color: Onyx (#343A40). oklch(33.2% 0.025 339.8), rgb(63, 49, 58).
Aa
White text reads best on this color (12.26:1).
About this color
#3F313A is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.032 away. White text reads best on it, at 12.26:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #3F313A |
| RGB | rgb(63, 49, 58) |
| HSL | hsl(321, 13%, 22%) |
| OKLCH | oklch(33.2% 0.025 339.8) |
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 #3F313A | 12.26:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #3F313A | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #3F313A text on white | 12.26:1 | AAA | Lc 98.0 | Preferred for body text |
| #3F313A text on black | 1.71:1 | 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
#ECE8EB
oklch(93.5% 0.006 334)
-
Step 200
200
#DED6DB
oklch(88.4% 0.011 339.4)
-
Step 300
300
#C9BCC4
oklch(80.8% 0.018 340)
-
Step 400
400
#AE9AA7
oklch(70.8% 0.03 338.8)
-
Step 500
500
#9A8191
oklch(63.1% 0.038 339.7)
-
Step 600
600
#856A7B
oklch(55.6% 0.042 340.4)
-
Step 700
700
#705868
oklch(49% 0.039 338.8)
-
Step 800
800
#5B4855
oklch(42.6% 0.033 337.9)
-
Step 900
900 (this color)
#3F313A
oklch(33.2% 0.025 339.8)
-
Step 950
950
#2C2329
oklch(26.9% 0.017 338.5)
#3F313A 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) | #31343A | 0.026 |
| Deuteranopia (no green cones) | #35363A | 0.023 |
| Tritanopia (no blue cones) | #413134 | 0.011 |
| Achromatopsia (no color) | #353535 | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F313A
#3F313A
oklch(33.2% 0.025 339.8)
- #2B3A31
#2B3A31
oklch(33.2% 0.025 158.3)
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 #3F313A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.032
- Gunmetal #293241 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.069
- Midnight Green #073B4C ΔE 0.073
- Charcoal #264653 ΔE 0.073
Use #3F313A 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.