#40504C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.6% 0.021 178.3), rgb(64, 80, 76).
Aa
White text reads best on this color (8.50:1).
About this color
#40504C is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.50:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #40504C |
| RGB | rgb(64, 80, 76) |
| HSL | hsl(165, 11%, 28%) |
| OKLCH | oklch(41.6% 0.021 178.3) |
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 #40504C | 8.50:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #40504C | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #40504C text on white | 8.50:1 | AAA | Lc 89.3 | Fine for body text |
| #40504C text on black | 2.46:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D5DBD9
oklch(88.6% 0.007 174.4)
-
Step 300
300
#B9C3C0
oklch(80.9% 0.012 176.2)
-
Step 400
400
#94A5A0
oklch(70.7% 0.02 176.2)
-
Step 500
500
#7A8F89
oklch(63.2% 0.026 176.3)
-
Step 600
600
#637973
oklch(55.7% 0.027 176.9)
-
Step 700
700
#526661
oklch(49.2% 0.025 178.3)
-
Step 800
800 (this color)
#40504C
oklch(41.6% 0.021 178.3)
-
Step 900
900
#394542
oklch(37.9% 0.016 178.6)
-
Step 950
950
#212826
oklch(26.9% 0.011 176.4)
#40504C 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) | #4F4E4C | 0.023 |
| Deuteranopia (no green cones) | #4C4C4C | 0.021 |
| Tritanopia (no blue cones) | #3C514F | 0.007 |
| Achromatopsia (no color) | #4D4D4D | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40504C
#40504C
oklch(41.6% 0.021 178.3)
- #56474C
#56474C
oklch(41.5% 0.022 356.1)
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 #40504C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.048
- Deep Teal #00555A ΔE 0.051
- Charcoal #264653 ΔE 0.053
- Dark Blue Green #005249 ΔE 0.054
- Dark Teal #014D4E ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.057
- Dark Green Blue #1F6357 ΔE 0.062
Use #40504C 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.