#3F404E
Closest named color: Charcoal Grey (#3C4142). oklch(37.6% 0.024 282), rgb(63, 64, 78).
Aa
White text reads best on this color (10.22:1).
About this color
#3F404E is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.024. 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 10.22:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #3F404E |
| RGB | rgb(63, 64, 78) |
| HSL | hsl(236, 11%, 28%) |
| OKLCH | oklch(37.6% 0.024 282) |
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 #3F404E | 10.22:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #3F404E | 2.05:1 | Fails | Lc 10.2 | Not readable |
| #3F404E text on white | 10.22:1 | AAA | Lc 93.7 | Preferred for body text |
| #3F404E text on black | 2.05:1 | Fails | Lc -8.8 | 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
#E9E9ED
oklch(93.5% 0.005 286.3)
-
Step 200
200
#D8D8E0
oklch(88.5% 0.011 286.2)
-
Step 300
300
#BEBFCC
oklch(80.8% 0.018 282.5)
-
Step 400
400
#9D9FB3
oklch(70.7% 0.029 281.1)
-
Step 500
500
#8587A0
oklch(63% 0.037 281.7)
-
Step 600
600
#6F718B
oklch(55.6% 0.04 281.5)
-
Step 700
700
#5D5E76
oklch(49% 0.038 283)
-
Step 800
800
#4C4D60
oklch(42.7% 0.031 282.6)
-
Step 900
900 (this color)
#3F404E
oklch(37.6% 0.024 282)
-
Step 950
950
#25262E
oklch(27.1% 0.015 279.7)
#3F404E 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) | #3D414F | 0.004 |
| Deuteranopia (no green cones) | #3C404E | 0.005 |
| Tritanopia (no blue cones) | #3C4245 | 0.020 |
| Achromatopsia (no color) | #414141 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F404E
#3F404E
oklch(37.6% 0.024 282)
- #444233
#444233
oklch(37.6% 0.025 101.2)
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 #3F404E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.023
- Onyx #343A40 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.051
- Gunmetal #293241 ΔE 0.062
- Dark Teal #014D4E ΔE 0.067
Use #3F404E 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.