#3F474F
Closest named color: Charcoal Grey (#3C4142). oklch(39.4% 0.017 248.3), rgb(63, 71, 79).
Aa
White text reads best on this color (9.43:1).
About this color
#3F474F is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.026 away. White text reads best on it, at 9.43:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.22:1 |
| White text | 9.43:1 |
Values
| HEX | #3F474F |
| RGB | rgb(63, 71, 79) |
| HSL | hsl(210, 11%, 28%) |
| OKLCH | oklch(39.4% 0.017 248.3) |
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 #3F474F | 9.43:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #3F474F | 2.22:1 | Fails | Lc 12.1 | Not readable |
| #3F474F text on white | 9.43:1 | AAA | Lc 91.8 | Preferred for body text |
| #3F474F text on black | 2.22:1 | Fails | Lc -10.6 | 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#BAC1C9
oklch(80.8% 0.014 251.6)
-
Step 400
400
#97A2AD
oklch(70.7% 0.02 248.1)
-
Step 500
500
#7D8B99
oklch(63% 0.027 248.3)
-
Step 600
600
#677584
oklch(55.6% 0.029 250.2)
-
Step 700
700
#55626F
oklch(49% 0.026 248.4)
-
Step 800
800
#46505B
oklch(42.7% 0.022 250.8)
-
Step 900
900 (this color)
#3F474F
oklch(39.4% 0.017 248.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#3F474F 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) | #44474F | 0.008 |
| Deuteranopia (no green cones) | #42454F | 0.008 |
| Tritanopia (no blue cones) | #3B494A | 0.014 |
| Achromatopsia (no color) | #464646 | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F474F
#3F474F
oklch(39.4% 0.017 248.3)
- #4C443C
#4C443C
oklch(39.2% 0.017 67.3)
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 #3F474F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.032
- Charcoal #264653 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.036
- Onyx #343A40 ΔE 0.049
- Dark Teal #014D4E ΔE 0.057
- Deep Teal #00555A ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #3F474F 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.