#3F4149
Closest named color: Charcoal Grey (#3C4142). oklch(37.6% 0.014 274.6), rgb(63, 65, 73).
Aa
White text reads best on this color (10.17:1).
About this color
#3F4149 is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.014. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.014 away. White text reads best on it, at 10.17:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.014) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #3F4149 |
| RGB | rgb(63, 65, 73) |
| HSL | hsl(228, 7%, 27%) |
| OKLCH | oklch(37.6% 0.014 274.6) |
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 #3F4149 | 10.17:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #3F4149 | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #3F4149 text on white | 10.17:1 | AAA | Lc 93.6 | Preferred for body text |
| #3F4149 text on black | 2.06:1 | Fails | Lc -8.9 | 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 900.
-
Step 50
50
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E9EAEC
oklch(93.7% 0.003 264.5)
-
Step 200
200
#D8D9DD
oklch(88.6% 0.006 275)
-
Step 300
300
#BEC0C7
oklch(80.8% 0.01 273.3)
-
Step 400
400
#9DA0AB
oklch(70.7% 0.016 273.8)
-
Step 500
500
#858997
oklch(63.1% 0.021 273.1)
-
Step 600
600
#6F7381
oklch(55.7% 0.022 273)
-
Step 700
700
#5D606D
oklch(49.1% 0.021 275.3)
-
Step 800
800
#4C4E59
oklch(42.6% 0.018 277.4)
-
Step 900
900 (this color)
#3F4149
oklch(37.6% 0.014 274.6)
-
Step 950
950
#25262B
oklch(27% 0.009 276.8)
#3F4149 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) | #3F4249 | 0.003 |
| Deuteranopia (no green cones) | #3E4149 | 0.002 |
| Tritanopia (no blue cones) | #3D4244 | 0.011 |
| Achromatopsia (no color) | #414141 | 0.014 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3F4149, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.014
- Onyx #343A40 ΔE 0.032
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.052
- Gunmetal #293241 ΔE 0.063
- Dark Teal #014D4E ΔE 0.063
Use #3F4149 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.