#283C42
Closest named color: Onyx (#343A40). oklch(34.2% 0.027 218.4), rgb(40, 60, 66).
Aa
White text reads best on this color (11.56:1).
About this color
#283C42 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.018 away. White text reads best on it, at 11.56:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.81:1 |
| White text | 11.56:1 |
Values
| HEX | #283C42 |
| RGB | rgb(40, 60, 66) |
| HSL | hsl(194, 25%, 21%) |
| OKLCH | oklch(34.2% 0.027 218.4) |
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 #283C42 | 11.56:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #283C42 | 1.81:1 | Fails | Lc 0.0 | Not readable |
| #283C42 text on white | 11.56:1 | AAA | Lc 96.6 | Preferred for body text |
| #283C42 text on black | 1.81:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B3C4CA
oklch(80.9% 0.02 220.9)
-
Step 400
400
#8AA6AE
oklch(70.7% 0.033 216.9)
-
Step 500
500
#6D909B
oklch(63.1% 0.042 219.1)
-
Step 600
600
#547A85
oklch(55.5% 0.046 217.8)
-
Step 700
700
#456771
oklch(49.2% 0.042 218.2)
-
Step 800
800
#39545C
oklch(42.8% 0.035 218.2)
-
Step 900
900 (this color)
#283C42
oklch(34.2% 0.027 218.4)
-
Step 950
950
#1D292C
oklch(27.1% 0.017 214.8)
#283C42 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) | #383B42 | 0.024 |
| Deuteranopia (no green cones) | #343842 | 0.021 |
| Tritanopia (no blue cones) | #1F3E3E | 0.016 |
| Achromatopsia (no color) | #393939 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C42
#283C42
oklch(34.2% 0.027 218.4)
- #45342E
#45342E
oklch(34.2% 0.027 40.3)
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 #283C42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.018
- Dark Blue Grey #1F3B4D ΔE 0.023
- Gunmetal #293241 ΔE 0.034
- Midnight Green #073B4C ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.036
- Charcoal #264653 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.050
Use #283C42 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.