#3F402F
Closest named color: Charcoal Grey (#3C4142). oklch(36.5% 0.028 110.5), rgb(63, 64, 47).
Aa
White text reads best on this color (10.57:1).
About this color
#3F402F is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.030 away. White text reads best on it, at 10.57:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #3F402F |
| RGB | rgb(63, 64, 47) |
| HSL | hsl(64, 15%, 22%) |
| OKLCH | oklch(36.5% 0.028 110.5) |
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 #3F402F | 10.57:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #3F402F | 1.98:1 | Fails | Lc 9.4 | Not readable |
| #3F402F text on white | 10.57:1 | AAA | Lc 94.5 | Preferred for body text |
| #3F402F text on black | 1.98:1 | Fails | Lc -8.0 | 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
#F5F6F3
oklch(97.2% 0.004 121.6)
-
Step 100
100
#EAEAE6
oklch(93.6% 0.005 106.5)
-
Step 200
200
#D9DAD1
oklch(88.5% 0.012 111.8)
-
Step 300
300
#C1C2B3
oklch(80.9% 0.021 109.9)
-
Step 400
400
#A1A38B
oklch(70.7% 0.034 111.1)
-
Step 500
500
#8A8C6E
oklch(63% 0.043 110.7)
-
Step 600
600
#747656
oklch(55.5% 0.047 110.8)
-
Step 700
700
#626347
oklch(49.1% 0.042 109.6)
-
Step 800
800
#50513A
oklch(42.7% 0.036 109.9)
-
Step 900
900 (this color)
#3F402F
oklch(36.5% 0.028 110.5)
-
Step 950
950
#27271D
oklch(26.9% 0.018 107.5)
#3F402F 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) | #433E2E | 0.009 |
| Deuteranopia (no green cones) | #433F30 | 0.008 |
| Tritanopia (no blue cones) | #413E3B | 0.024 |
| Achromatopsia (no color) | #3F3F3F | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F402F
#3F402F
oklch(36.5% 0.028 110.5)
- #3E3C4C
#3E3C4C
oklch(36.5% 0.027 290.7)
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 #3F402F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.030
- Onyx #343A40 ΔE 0.044
- Dark Olive #373E02 ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.059
- Pakistan Green #283618 ΔE 0.060
- Charcoal #264653 ΔE 0.062
- Evergreen #05472A ΔE 0.066
- Dark Teal #014D4E ΔE 0.070
Use #3F402F 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.