#3F504C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.5% 0.022 179.2), rgb(63, 80, 76).
Aa
White text reads best on this color (8.52:1).
About this color
#3F504C is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.022. 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 8.52:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #3F504C |
| RGB | rgb(63, 80, 76) |
| HSL | hsl(166, 12%, 28%) |
| OKLCH | oklch(41.5% 0.022 179.2) |
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 #3F504C | 8.52:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #3F504C | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #3F504C text on white | 8.52:1 | AAA | Lc 89.3 | Fine for body text |
| #3F504C text on black | 2.46:1 | Fails | Lc -12.9 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D4DBD9
oklch(88.5% 0.008 177.3)
-
Step 300
300
#B8C3C1
oklch(80.8% 0.012 184)
-
Step 400
400
#93A5A1
oklch(70.7% 0.021 180.8)
-
Step 500
500
#798F8A
oklch(63.1% 0.026 180.1)
-
Step 600
600
#617974
oklch(55.5% 0.029 181.1)
-
Step 700
700
#516661
oklch(49.1% 0.026 179)
-
Step 800
800 (this color)
#3F504C
oklch(41.5% 0.022 179.2)
-
Step 900
900
#384542
oklch(37.8% 0.018 179.8)
-
Step 950
950
#212826
oklch(26.9% 0.011 176.4)
#3F504C 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) | #4F4E4C | 0.025 |
| Deuteranopia (no green cones) | #4B4B4C | 0.023 |
| Tritanopia (no blue cones) | #3B514F | 0.007 |
| Achromatopsia (no color) | #4C4C4C | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F504C
#3F504C
oklch(41.5% 0.022 179.2)
- #57474B
#57474B
oklch(41.6% 0.023 1.4)
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 #3F504C, 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 0.048
- Deep Teal #00555A ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Dark Blue Green #005249 ΔE 0.053
- Dark Teal #014D4E ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.056
- Dark Green Blue #1F6357 ΔE 0.061
Use #3F504C 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.