#3F4F40
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.9% 0.032 146.6), rgb(63, 79, 64).
Aa
White text reads best on this color (8.73:1).
About this color
#3F4F40 is a dark, muted green. In OKLCH its lightness is 41%, its chroma 0.032 and its hue 147°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.73:1.
| Hue family | Greens |
| Lightness | dark (41%) |
| Chroma | muted (0.032) |
| Temperature | in between |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.40:1 |
| White text | 8.73:1 |
Values
| HEX | #3F4F40 |
| RGB | rgb(63, 79, 64) |
| HSL | hsl(124, 11%, 28%) |
| OKLCH | oklch(40.9% 0.032 146.6) |
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 #3F4F40 | 8.73:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #3F4F40 | 2.40:1 | Fails | Lc 14.0 | Not readable |
| #3F4F40 text on white | 8.73:1 | AAA | Lc 89.9 | Fine for body text |
| #3F4F40 text on black | 2.40:1 | Fails | Lc -12.3 | 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 800.
-
Step 50
50
#F4F6F4
oklch(97.1% 0.003 145.5)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D5DBD5
oklch(88.5% 0.01 145.5)
-
Step 300
300
#B9C4BA
oklch(80.9% 0.018 148.1)
-
Step 400
400
#95A696
oklch(70.7% 0.03 146.9)
-
Step 500
500
#7B907C
oklch(63.1% 0.038 146.4)
-
Step 600
600
#647A65
oklch(55.6% 0.041 146.2)
-
Step 700
700
#536754
oklch(49.1% 0.038 146.3)
-
Step 800
800 (this color)
#3F4F40
oklch(40.9% 0.032 146.6)
-
Step 900
900
#39453A
oklch(37.6% 0.024 147.4)
-
Step 950
950
#222922
oklch(27.2% 0.016 145.1)
#3F4F40 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) | #504C3F | 0.027 |
| Deuteranopia (no green cones) | #4D4A41 | 0.026 |
| Tritanopia (no blue cones) | #3D4E4B | 0.019 |
| Achromatopsia (no color) | #4B4B4B | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F40
#3F4F40
oklch(40.9% 0.032 146.6)
- #544453
#544453
oklch(40.9% 0.032 328.2)
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 #3F4F40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.048
- Dark Blue Green #005249 ΔE 0.051
- Dark Teal #014D4E ΔE 0.057
- Deep Teal #00555A ΔE 0.058
- Pine #2B5D34 ΔE 0.059
- Charcoal #264653 ΔE 0.060
- Dark Green Blue #1F6357 ΔE 0.065
Use #3F4F40 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.