#404351
Closest named color: Charcoal Grey (#3C4142). oklch(38.6% 0.024 275.7), rgb(64, 67, 81).
Aa
White text reads best on this color (9.81:1).
About this color
#404351 is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.026 away. White text reads best on it, at 9.81:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.13:1 |
| White text | 9.81:1 |
Values
| HEX | #404351 |
| RGB | rgb(64, 67, 81) |
| HSL | hsl(229, 12%, 28%) |
| OKLCH | oklch(38.6% 0.024 275.7) |
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 #404351 | 9.81:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #404351 | 2.13:1 | Fails | Lc 11.2 | Not readable |
| #404351 text on white | 9.81:1 | AAA | Lc 92.8 | Preferred for body text |
| #404351 text on black | 2.13:1 | Fails | Lc -9.7 | 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
#E9EAED
oklch(93.7% 0.004 271.4)
-
Step 200
200
#D7D9E0
oklch(88.6% 0.01 273.3)
-
Step 300
300
#BDC0CD
oklch(80.9% 0.018 275.6)
-
Step 400
400
#9B9FB3
oklch(70.6% 0.029 276.6)
-
Step 500
500
#8388A0
oklch(63.1% 0.036 276)
-
Step 600
600
#6C728B
oklch(55.6% 0.039 274.5)
-
Step 700
700
#5A5F76
oklch(49% 0.037 275.3)
-
Step 800
800
#4A4E60
oklch(42.7% 0.03 275.2)
-
Step 900
900 (this color)
#404351
oklch(38.6% 0.024 275.7)
-
Step 950
950
#24262E
oklch(27% 0.015 274.3)
#404351 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) | #3F4452 | 0.003 |
| Deuteranopia (no green cones) | #3E4351 | 0.003 |
| Tritanopia (no blue cones) | #3C4548 | 0.020 |
| Achromatopsia (no color) | #444444 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404351
#404351
oklch(38.6% 0.024 275.7)
- #484435
#484435
oklch(38.6% 0.025 94.9)
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 #404351, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal #264653 ΔE 0.035
- Onyx #343A40 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.056
- Dark Teal #014D4E ΔE 0.065
- Gunmetal #293241 ΔE 0.071
Use #404351 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.