#3F4E50
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.2% 0.019 206.4), rgb(63, 78, 80).
Aa
White text reads best on this color (8.68:1).
About this color
#3F4E50 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.021 away. White text reads best on it, at 8.68:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #3F4E50 |
| RGB | rgb(63, 78, 80) |
| HSL | hsl(187, 12%, 28%) |
| OKLCH | oklch(41.2% 0.019 206.4) |
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 #3F4E50 | 8.68:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #3F4E50 | 2.41:1 | Fails | Lc 14.2 | Not readable |
| #3F4E50 text on white | 8.68:1 | AAA | Lc 89.8 | Fine for body text |
| #3F4E50 text on black | 2.41:1 | Fails | Lc -12.5 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D5DADB
oklch(88.5% 0.006 211)
-
Step 300
300
#B9C3C4
oklch(81% 0.011 204.1)
-
Step 400
400
#94A4A6
oklch(70.7% 0.018 205.8)
-
Step 500
500
#7A8E90
oklch(63.2% 0.023 204)
-
Step 600
600
#63787B
oklch(55.7% 0.025 207)
-
Step 700
700
#526567
oklch(49.2% 0.023 204.3)
-
Step 800
800 (this color)
#3F4E50
oklch(41.2% 0.019 206.4)
-
Step 900
900
#394445
oklch(37.7% 0.014 203.3)
-
Step 950
950
#212829
oklch(27% 0.01 207.1)
#3F4E50 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) | #4C4D50 | 0.020 |
| Deuteranopia (no green cones) | #484A50 | 0.018 |
| Tritanopia (no blue cones) | #3A4F4F | 0.008 |
| Achromatopsia (no color) | #4B4B4B | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E50
#3F4E50
oklch(41.2% 0.019 206.4)
- #554745
#554745
oklch(41.2% 0.019 27.5)
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 #3F4E50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.021
- Charcoal Grey #3C4142 ΔE 0.043
- Charcoal #264653 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.048
- Deep Teal #00555A ΔE 0.051
- Dark Teal #014D4E ΔE 0.055
- Dark Blue Green #005249 ΔE 0.056
- Petrol #005F6A ΔE 0.066
Use #3F4E50 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.