#3F4D52
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41% 0.02 221.5), rgb(63, 77, 82).
Aa
White text reads best on this color (8.76:1).
About this color
#3F4D52 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.76:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #3F4D52 |
| RGB | rgb(63, 77, 82) |
| HSL | hsl(196, 13%, 28%) |
| OKLCH | oklch(41% 0.02 221.5) |
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 #3F4D52 | 8.76:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #3F4D52 | 2.39:1 | Fails | Lc 13.9 | Not readable |
| #3F4D52 text on white | 8.76:1 | AAA | Lc 90.0 | Preferred for body text |
| #3F4D52 text on black | 2.39:1 | Fails | Lc -12.2 | 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
#D5DADC
oklch(88.5% 0.006 223.5)
-
Step 300
300
#B9C2C6
oklch(80.8% 0.011 226)
-
Step 400
400
#95A3A9
oklch(70.6% 0.018 225.3)
-
Step 500
500
#7B8D94
oklch(63.1% 0.023 223.2)
-
Step 600
600
#63777E
oklch(55.6% 0.026 221)
-
Step 700
700
#52646A
oklch(49% 0.024 220)
-
Step 800
800 (this color)
#3F4D52
oklch(41% 0.02 221.5)
-
Step 900
900
#394447
oklch(37.8% 0.015 216)
-
Step 950
950
#21282A
oklch(27.1% 0.011 216.9)
#3F4D52 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) | #4A4C52 | 0.017 |
| Deuteranopia (no green cones) | #474A52 | 0.015 |
| Tritanopia (no blue cones) | #3A4F4F | 0.012 |
| Achromatopsia (no color) | #4B4B4B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4D52
#3F4D52
oklch(41% 0.02 221.5)
- #544742
#544742
oklch(41% 0.02 42.2)
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 #3F4D52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.041
- Charcoal #264653 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.044
- Deep Teal #00555A ΔE 0.052
- Dark Teal #014D4E ΔE 0.056
- Dark Blue Green #005249 ΔE 0.059
- YInMn Blue #415A77 ΔE 0.065
Use #3F4D52 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.