#40534E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.5% 0.025 177.2), rgb(64, 83, 78).
Aa
White text reads best on this color (8.18:1).
About this color
#40534E is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 8.18:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.56:1 |
| White text | 8.18:1 |
Values
| HEX | #40534E |
| RGB | rgb(64, 83, 78) |
| HSL | hsl(164, 13%, 29%) |
| OKLCH | oklch(42.5% 0.025 177.2) |
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 #40534E | 8.18:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #40534E | 2.56:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #40534E text on white | 8.18:1 | AAA | Lc 88.3 | Fine for body text |
| #40534E text on black | 2.56:1 | Fails | Lc -13.9 | 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
#B7C4C0
oklch(80.9% 0.015 175.6)
-
Step 400
400
#92A6A0
oklch(70.8% 0.024 175.6)
-
Step 500
500
#779089
oklch(63.2% 0.03 176.5)
-
Step 600
600
#5F7A73
oklch(55.6% 0.033 177.4)
-
Step 700
700
#4F6760
oklch(49.2% 0.031 175.2)
-
Step 800
800 (this color)
#40534E
oklch(42.5% 0.025 177.2)
-
Step 900
900
#374541
oklch(37.7% 0.019 176)
-
Step 950
950
#202826
oklch(26.8% 0.012 178.5)
#40534E 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) | #51514E | 0.026 |
| Deuteranopia (no green cones) | #4E4E4E | 0.025 |
| Tritanopia (no blue cones) | #3B5451 | 0.007 |
| Achromatopsia (no color) | #4F4F4F | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40534E
#40534E
oklch(42.5% 0.025 177.2)
- #5A494E
#5A494E
oklch(42.5% 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 #40534E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Deep Teal #00555A ΔE 0.050
- Dark Green Blue #1F6357 ΔE 0.054
- Dark Blue Green #005249 ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.057
- Charcoal #264653 ΔE 0.059
- Petrol #005F6A ΔE 0.060
- Dark Teal #014D4E ΔE 0.060
Use #40534E 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.