#3F4239
Closest named color: Charcoal Grey (#3C4142). oklch(37.3% 0.016 122.2), rgb(63, 66, 57).
Aa
White text reads best on this color (10.24:1).
About this color
#3F4239 is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.017 away. White text reads best on it, at 10.24:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.04:1 |
| White text | 10.24:1 |
Values
| HEX | #3F4239 |
| RGB | rgb(63, 66, 57) |
| HSL | hsl(80, 7%, 24%) |
| OKLCH | oklch(37.3% 0.016 122.2) |
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 #3F4239 | 10.24:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #3F4239 | 2.04:1 | Fails | Lc 10.1 | Not readable |
| #3F4239 text on white | 10.24:1 | AAA | Lc 93.8 | Preferred for body text |
| #3F4239 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
#F5F5F4
oklch(97% 0.001 106.4)
-
Step 100
100
#E9EAE8
oklch(93.6% 0.003 128.5)
-
Step 200
200
#D8DAD5
oklch(88.5% 0.007 124.5)
-
Step 300
300
#BFC2BA
oklch(80.9% 0.012 123.5)
-
Step 400
400
#9EA396
oklch(70.8% 0.019 124.1)
-
Step 500
500
#878C7C
oklch(63.1% 0.024 121.2)
-
Step 600
600
#707665
oklch(55.6% 0.027 123.1)
-
Step 700
700
#5E6354
oklch(49.1% 0.024 122.3)
-
Step 800
800
#4D5145
oklch(42.7% 0.02 122.3)
-
Step 900
900 (this color)
#3F4239
oklch(37.3% 0.016 122.2)
-
Step 950
950
#252722
oklch(26.9% 0.01 124.9)
#3F4239 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) | #434139 | 0.007 |
| Deuteranopia (no green cones) | #434139 | 0.007 |
| Tritanopia (no blue cones) | #40413F | 0.012 |
| Achromatopsia (no color) | #414141 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4239
#3F4239
oklch(37.3% 0.016 122.2)
- #423F48
#423F48
oklch(37.4% 0.016 300.8)
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 #3F4239, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.017
- Onyx #343A40 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.060
- Dark Teal #014D4E ΔE 0.063
- Dark Blue Grey #1F3B4D ΔE 0.065
- Dark Blue Green #005249 ΔE 0.067
Use #3F4239 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.