#40524E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.2% 0.023 180.1), rgb(64, 82, 78).
Aa
White text reads best on this color (8.28:1).
About this color
#40524E is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.025 away. White text reads best on it, at 8.28:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.53:1 |
| White text | 8.28:1 |
Values
| HEX | #40524E |
| RGB | rgb(64, 82, 78) |
| HSL | hsl(167, 12%, 29%) |
| OKLCH | oklch(42.2% 0.023 180.1) |
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 #40524E | 8.28:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #40524E | 2.53:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #40524E text on white | 8.28:1 | AAA | Lc 88.6 | Fine for body text |
| #40524E text on black | 2.53:1 | Fails | Lc -13.6 | 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 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
#D4DBD9
oklch(88.5% 0.008 177.3)
-
Step 300
300
#B8C4C1
oklch(81% 0.014 179.4)
-
Step 400
400
#93A5A1
oklch(70.7% 0.021 180.8)
-
Step 500
500
#788F8A
oklch(63% 0.027 180.8)
-
Step 600
600
#607974
oklch(55.5% 0.03 181.6)
-
Step 700
700
#506661
oklch(49.1% 0.028 179.7)
-
Step 800
800 (this color)
#40524E
oklch(42.2% 0.023 180.1)
-
Step 900
900
#374542
oklch(37.7% 0.019 180.8)
-
Step 950
950
#212827
oklch(27% 0.01 186.1)
#40524E 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) | #50504E | 0.024 |
| Deuteranopia (no green cones) | #4D4D4E | 0.024 |
| Tritanopia (no blue cones) | #3B5351 | 0.007 |
| Achromatopsia (no color) | #4E4E4E | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40524E
#40524E
oklch(42.2% 0.023 180.1)
- #59484D
#59484D
oklch(42.1% 0.024 358.6)
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 #40524E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.025
- Deep Teal #00555A ΔE 0.050
- Charcoal Grey #3C4142 ΔE 0.054
- Dark Blue Green #005249 ΔE 0.055
- Dark Green Blue #1F6357 ΔE 0.057
- Charcoal #264653 ΔE 0.057
- Dark Teal #014D4E ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.060
Use #40524E 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.