#3F444E
Closest named color: Charcoal Grey (#3C4142). oklch(38.6% 0.018 264.3), rgb(63, 68, 78).
Aa
White text reads best on this color (9.77:1).
About this color
#3F444E is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.021 away. White text reads best on it, at 9.77:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.14:1 |
| White text | 9.77:1 |
Values
| HEX | #3F444E |
| RGB | rgb(63, 68, 78) |
| HSL | hsl(220, 11%, 28%) |
| OKLCH | oklch(38.6% 0.018 264.3) |
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 #3F444E | 9.77:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #3F444E | 2.14:1 | Fails | Lc 11.3 | Not readable |
| #3F444E text on white | 9.77:1 | AAA | Lc 92.7 | Preferred for body text |
| #3F444E text on black | 2.14:1 | Fails | Lc -9.8 | 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
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BCC1CA
oklch(81% 0.014 262.4)
-
Step 400
400
#9AA1AF
oklch(70.8% 0.022 264.4)
-
Step 500
500
#818A9B
oklch(63.2% 0.028 263.3)
-
Step 600
600
#6A7386
oklch(55.5% 0.031 265.3)
-
Step 700
700
#596171
oklch(49.2% 0.028 264.3)
-
Step 800
800
#494F5C
oklch(42.7% 0.023 265.8)
-
Step 900
900 (this color)
#3F444E
oklch(38.6% 0.018 264.3)
-
Step 950
950
#24262C
oklch(26.9% 0.012 271)
#3F444E 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) | #41454E | 0.005 |
| Deuteranopia (no green cones) | #40434E | 0.003 |
| Tritanopia (no blue cones) | #3B4647 | 0.017 |
| Achromatopsia (no color) | #444444 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F444E
#3F444E
oklch(38.6% 0.018 264.3)
- #484339
#484339
oklch(38.5% 0.018 84.6)
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 #3F444E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.021
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.039
- Onyx #343A40 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.057
- Dark Teal #014D4E ΔE 0.060
- Deep Teal #00555A ΔE 0.067
Use #3F444E 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.