#42545E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.5% 0.028 232.6), rgb(66, 84, 94).
Aa
White text reads best on this color (7.89:1).
About this color
#42545E 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 0.039 away. White text reads best on it, at 7.89:1.
| Hue family | Neutrals |
| Lightness | dark (43%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.66:1 |
| White text | 7.89:1 |
Values
| HEX | #42545E |
| RGB | rgb(66, 84, 94) |
| HSL | hsl(201, 18%, 31%) |
| OKLCH | oklch(43.5% 0.028 232.6) |
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 #42545E | 7.89:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #42545E | 2.66:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #42545E text on white | 7.89:1 | AAA | Lc 87.4 | Fine for body text |
| #42545E text on black | 2.66:1 | Fails | Lc -14.8 | 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
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B7C3C9
oklch(81% 0.016 229)
-
Step 400
400
#91A4AE
oklch(70.7% 0.026 230.6)
-
Step 500
500
#768D9B
oklch(63% 0.034 234.8)
-
Step 600
600
#5F7785
oklch(55.5% 0.036 233.9)
-
Step 700
700
#4E6471
oklch(49% 0.034 234.3)
-
Step 800
800 (this color)
#42545E
oklch(43.5% 0.028 232.6)
-
Step 900
900
#36444B
oklch(37.7% 0.022 229.7)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#42545E 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) | #4F535F | 0.019 |
| Deuteranopia (no green cones) | #4B505E | 0.017 |
| Tritanopia (no blue cones) | #395757 | 0.021 |
| Achromatopsia (no color) | #515151 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42545E
#42545E
oklch(43.5% 0.028 232.6)
- #5E4D43
#5E4D43
oklch(43.5% 0.028 52.2)
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 #42545E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.039
- YInMn Blue #415A77 ΔE 0.041
- Dusty Grape #545775 ΔE 0.048
- Petrol #005F6A ΔE 0.053
- Deep Teal #00555A ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.058
- Slate #516572 ΔE 0.061
- Dark Green Blue #1F6357 ΔE 0.061
Use #42545E 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.