#40474F
Closest named color: Charcoal Grey (#3C4142). oklch(39.5% 0.016 251.8), rgb(64, 71, 79).
Aa
White text reads best on this color (9.40:1).
About this color
#40474F is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.016. 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 9.40:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #40474F |
| RGB | rgb(64, 71, 79) |
| HSL | hsl(212, 10%, 28%) |
| OKLCH | oklch(39.5% 0.016 251.8) |
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 #40474F | 9.40:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #40474F | 2.23:1 | Fails | Lc 12.2 | Not readable |
| #40474F text on white | 9.40:1 | AAA | Lc 91.8 | Preferred for body text |
| #40474F text on black | 2.23:1 | Fails | Lc -10.6 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
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
#BBC1C8
oklch(80.8% 0.012 252.1)
-
Step 400
400
#98A2AD
oklch(70.8% 0.02 250.7)
-
Step 500
500
#7F8B99
oklch(63.2% 0.025 252.3)
-
Step 600
600
#687583
oklch(55.7% 0.027 250.3)
-
Step 700
700
#56626F
oklch(49.1% 0.026 250.5)
-
Step 800
800
#47505A
oklch(42.7% 0.02 251.1)
-
Step 900
900 (this color)
#40474F
oklch(39.5% 0.016 251.8)
-
Step 950
950
#23272B
oklch(27% 0.009 248.2)
#40474F 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) | #44474F | 0.006 |
| Deuteranopia (no green cones) | #42464F | 0.004 |
| Tritanopia (no blue cones) | #3C494A | 0.014 |
| Achromatopsia (no color) | #464646 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40474F
#40474F
oklch(39.5% 0.016 251.8)
- #4C453D
#4C453D
oklch(39.5% 0.016 71)
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 #40474F, 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 Slate Gray #2F4F4F ΔE 0.033
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.037
- Onyx #343A40 ΔE 0.050
- Dark Teal #014D4E ΔE 0.058
- Deep Teal #00555A ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.064
Use #40474F 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.