#42574F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.7% 0.029 169.7), rgb(66, 87, 79).
Aa
White text reads best on this color (7.75:1).
About this color
#42574F is a dark close to neutral grey. In OKLCH its lightness is 44%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.038 away. White text reads best on it, at 7.75:1.
| Hue family | Neutrals |
| Lightness | dark (44%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.70:1 |
| White text | 7.75:1 |
Values
| HEX | #42574F |
| RGB | rgb(66, 87, 79) |
| HSL | hsl(157, 14%, 30%) |
| OKLCH | oklch(43.7% 0.029 169.7) |
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 #42574F | 7.75:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #42574F | 2.70:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #42574F text on white | 7.75:1 | AAA | Lc 86.9 | Fine for body text |
| #42574F text on black | 2.70:1 | Fails | Lc -15.2 | Dividers and decoration only |
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
#E7EBE9
oklch(93.6% 0.005 165)
-
Step 200
200
#D3DBD8
oklch(88.4% 0.01 171.8)
-
Step 300
300
#B7C4BF
oklch(80.9% 0.016 170.9)
-
Step 400
400
#91A69E
oklch(70.6% 0.026 170.6)
-
Step 500
500
#759186
oklch(63.2% 0.036 169.3)
-
Step 600
600
#5E7B70
oklch(55.7% 0.038 169.7)
-
Step 700
700
#4D675D
oklch(49% 0.035 169.3)
-
Step 800
800 (this color)
#42574F
oklch(43.7% 0.029 169.7)
-
Step 900
900
#364640
oklch(37.8% 0.023 170.2)
-
Step 950
950
#202925
oklch(27.1% 0.015 166.5)
#42574F 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) | #56544F | 0.030 |
| Deuteranopia (no green cones) | #525150 | 0.029 |
| Tritanopia (no blue cones) | #3D5755 | 0.011 |
| Achromatopsia (no color) | #525252 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42574F
#42574F
oklch(43.7% 0.029 169.7)
- #5E4B54
#5E4B54
oklch(43.6% 0.029 348.2)
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 #42574F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.038
- Dark Green Blue #1F6357 ΔE 0.045
- Deep Teal #00555A ΔE 0.055
- Petrol #005F6A ΔE 0.057
- Pine #2B5D34 ΔE 0.060
- Dark Blue Green #005249 ΔE 0.061
- YInMn Blue #415A77 ΔE 0.065
- Dark Aqua #05696B ΔE 0.066
Use #42574F 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.