#3F494F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.9% 0.016 234.2), rgb(63, 73, 79).
Aa
White text reads best on this color (9.22:1).
About this color
#3F494F is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.016. 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 9.22:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #3F494F |
| RGB | rgb(63, 73, 79) |
| HSL | hsl(203, 11%, 28%) |
| OKLCH | oklch(39.9% 0.016 234.2) |
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 #3F494F | 9.22:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3F494F | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #3F494F text on white | 9.22:1 | AAA | Lc 91.3 | Preferred for body text |
| #3F494F text on black | 2.27:1 | Fails | Lc -11.1 | 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
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#B9C2C7
oklch(80.9% 0.012 231.7)
-
Step 400
400
#95A3AB
oklch(70.7% 0.02 232.6)
-
Step 500
500
#7B8C97
oklch(63% 0.026 236.2)
-
Step 600
600
#647681
oklch(55.5% 0.027 234.8)
-
Step 700
700
#53636D
oklch(49% 0.025 235.5)
-
Step 800
800
#445159
oklch(42.7% 0.021 235)
-
Step 900
900 (this color)
#3F494F
oklch(39.9% 0.016 234.2)
-
Step 950
950
#22272B
oklch(26.9% 0.01 242.1)
#3F494F 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) | #46494F | 0.011 |
| Deuteranopia (no green cones) | #44474F | 0.010 |
| Tritanopia (no blue cones) | #3B4B4B | 0.012 |
| Achromatopsia (no color) | #474747 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F494F
#3F494F
oklch(39.9% 0.016 234.2)
- #4F453F
#4F453F
oklch(39.9% 0.017 53)
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 #3F494F, 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 0.030
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.038
- Onyx #343A40 ΔE 0.054
- Dark Teal #014D4E ΔE 0.055
- Deep Teal #00555A ΔE 0.057
- Dark Blue Green #005249 ΔE 0.062
Use #3F494F 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.