#42515D
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.7% 0.028 242.5), rgb(66, 81, 93).
Aa
White text reads best on this color (8.18:1).
About this color
#42515D is a dark close to neutral grey. In OKLCH its lightness is 43%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.036 away. White text reads best on it, at 8.18:1.
| Hue family | Neutrals |
| Lightness | dark (43%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.56:1 |
| White text | 8.18:1 |
Values
| HEX | #42515D |
| RGB | rgb(66, 81, 93) |
| HSL | hsl(207, 17%, 31%) |
| OKLCH | oklch(42.7% 0.028 242.5) |
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 #42515D | 8.18:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #42515D | 2.56:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #42515D text on white | 8.18:1 | AAA | Lc 88.3 | Fine for body text |
| #42515D 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B8C2CA
oklch(80.9% 0.016 241.8)
-
Step 400
400
#93A3B0
oklch(70.7% 0.026 242.5)
-
Step 500
500
#798C9C
oklch(63.1% 0.033 243.7)
-
Step 600
600
#617687
oklch(55.5% 0.036 242.8)
-
Step 700
700
#516372
oklch(49% 0.033 243.6)
-
Step 800
800 (this color)
#42515D
oklch(42.7% 0.028 242.5)
-
Step 900
900
#38434C
oklch(37.7% 0.021 243)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#42515D 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) | #4C515E | 0.015 |
| Deuteranopia (no green cones) | #494E5D | 0.013 |
| Tritanopia (no blue cones) | #3A5455 | 0.022 |
| Achromatopsia (no color) | #4F4F4F | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42515D
#42515D
oklch(42.7% 0.028 242.5)
- #5A4C40
#5A4C40
oklch(42.7% 0.027 62.6)
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 #42515D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.036
- YInMn Blue #415A77 ΔE 0.045
- Dusty Grape #545775 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.051
- Charcoal #264653 ΔE 0.055
- Deep Teal #00555A ΔE 0.055
- Petrol #005F6A ΔE 0.058
- Charcoal Grey #3C4142 ΔE 0.060
Use #42515D 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.