#3F404C
Closest named color: Charcoal Grey (#3C4142). oklch(37.5% 0.02 281.6), rgb(63, 64, 76).
Aa
White text reads best on this color (10.24:1).
About this color
#3F404C is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.020 away. White text reads best on it, at 10.24:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.04:1 |
| White text | 10.24:1 |
Values
| HEX | #3F404C |
| RGB | rgb(63, 64, 76) |
| HSL | hsl(235, 9%, 27%) |
| OKLCH | oklch(37.5% 0.02 281.6) |
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 #3F404C | 10.24:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #3F404C | 2.04:1 | Fails | Lc 10.1 | Not readable |
| #3F404C text on white | 10.24:1 | AAA | Lc 93.8 | Preferred for body text |
| #3F404C text on black | 2.04:1 | Fails | Lc -8.7 | 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
#D8D8DF
oklch(88.4% 0.01 286.2)
-
Step 300
300
#BFC0CB
oklch(81% 0.015 281.9)
-
Step 400
400
#9E9FB0
oklch(70.7% 0.025 283.1)
-
Step 500
500
#86889D
oklch(63.2% 0.031 281.2)
-
Step 600
600
#707187
oklch(55.6% 0.034 283.2)
-
Step 700
700
#5D5F73
oklch(49.1% 0.032 280.7)
-
Step 800
800
#4C4D5D
oklch(42.5% 0.026 282.4)
-
Step 900
900 (this color)
#3F404C
oklch(37.5% 0.02 281.6)
-
Step 950
950
#25262D
oklch(27.1% 0.013 279.1)
#3F404C 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) | #3D414D | 0.004 |
| Deuteranopia (no green cones) | #3C404C | 0.005 |
| Tritanopia (no blue cones) | #3C4244 | 0.018 |
| Achromatopsia (no color) | #414141 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F404C
#3F404C
oklch(37.5% 0.02 281.6)
- #434235
#434235
oklch(37.6% 0.021 103.7)
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 #3F404C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.020
- Onyx #343A40 ΔE 0.032
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.050
- Gunmetal #293241 ΔE 0.061
- Dark Teal #014D4E ΔE 0.066
Use #3F404C 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.