#3F494E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.8% 0.015 229.3), rgb(63, 73, 78).
Aa
White text reads best on this color (9.23:1).
About this color
#3F494E is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 9.23:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #3F494E |
| RGB | rgb(63, 73, 78) |
| HSL | hsl(200, 11%, 28%) |
| OKLCH | oklch(39.8% 0.015 229.3) |
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 #3F494E | 9.23:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3F494E | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #3F494E text on white | 9.23:1 | AAA | Lc 91.3 | Preferred for body text |
| #3F494E text on black | 2.27:1 | Fails | Lc -11.0 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADC
oklch(88.5% 0.006 223.5)
-
Step 300
300
#B9C2C7
oklch(80.9% 0.012 231.7)
-
Step 400
400
#95A3AA
oklch(70.7% 0.019 229.1)
-
Step 500
500
#7B8D95
oklch(63.2% 0.024 226.4)
-
Step 600
600
#647780
oklch(55.7% 0.026 228.1)
-
Step 700
700
#53646C
oklch(49.2% 0.024 228)
-
Step 800
800
#445158
oklch(42.6% 0.02 231.4)
-
Step 900
900 (this color)
#3F494E
oklch(39.8% 0.015 229.3)
-
Step 950
950
#22272A
oklch(26.9% 0.009 234.1)
#3F494E 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) | #46484E | 0.011 |
| Deuteranopia (no green cones) | #44474E | 0.010 |
| Tritanopia (no blue cones) | #3B4A4B | 0.009 |
| Achromatopsia (no color) | #474747 | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F494E
#3F494E
oklch(39.8% 0.015 229.3)
- #4F4540
#4F4540
oklch(39.9% 0.016 48.3)
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 #3F494E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.029
- Charcoal #264653 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.039
- Onyx #343A40 ΔE 0.053
- Dark Teal #014D4E ΔE 0.055
- Deep Teal #00555A ΔE 0.057
- Dark Blue Green #005249 ΔE 0.061
Use #3F494E 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.