#3F424F
Closest named color: Charcoal Grey (#3C4142). oklch(38.1% 0.022 275), rgb(63, 66, 79).
Aa
White text reads best on this color (9.98:1).
About this color
#3F424F is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.023 away. White text reads best on it, at 9.98:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.10:1 |
| White text | 9.98:1 |
Values
| HEX | #3F424F |
| RGB | rgb(63, 66, 79) |
| HSL | hsl(229, 11%, 28%) |
| OKLCH | oklch(38.1% 0.022 275) |
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 #3F424F | 9.98:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #3F424F | 2.10:1 | Fails | Lc 10.7 | Not readable |
| #3F424F text on white | 9.98:1 | AAA | Lc 93.2 | Preferred for body text |
| #3F424F text on black | 2.10:1 | Fails | Lc -9.3 | 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 900.
-
Step 50
50
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9EAED
oklch(93.7% 0.004 271.4)
-
Step 200
200
#D7D9DF
oklch(88.6% 0.008 271.3)
-
Step 300
300
#BDC0CC
oklch(80.9% 0.017 274.8)
-
Step 400
400
#9BA0B2
oklch(70.8% 0.027 273.4)
-
Step 500
500
#83889F
oklch(63.1% 0.035 275.7)
-
Step 600
600
#6D728A
oklch(55.7% 0.038 275.9)
-
Step 700
700
#5B5F75
oklch(49% 0.036 276.9)
-
Step 800
800
#4A4E5F
oklch(42.7% 0.029 274.7)
-
Step 900
900 (this color)
#3F424F
oklch(38.1% 0.022 275)
-
Step 950
950
#24262E
oklch(27% 0.015 274.3)
#3F424F 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) | #3E4350 | 0.003 |
| Deuteranopia (no green cones) | #3D424F | 0.003 |
| Tritanopia (no blue cones) | #3B4446 | 0.020 |
| Achromatopsia (no color) | #424242 | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F424F
#3F424F
oklch(38.1% 0.022 275)
- #464335
#464335
oklch(38.1% 0.023 97.3)
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 #3F424F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal #264653 ΔE 0.034
- Onyx #343A40 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.053
- Dark Teal #014D4E ΔE 0.064
- Gunmetal #293241 ΔE 0.067
Use #3F424F 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.