#283C3E
Closest named color: Onyx (#343A40). oklch(34% 0.026 203.8), rgb(40, 60, 62).
Aa
White text reads best on this color (11.62:1).
About this color
#283C3E is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.019 away. White text reads best on it, at 11.62:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.62:1 |
Values
| HEX | #283C3E |
| RGB | rgb(40, 60, 62) |
| HSL | hsl(185, 22%, 20%) |
| OKLCH | oklch(34% 0.026 203.8) |
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 #283C3E | 11.62:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #283C3E | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #283C3E text on white | 11.62:1 | AAA | Lc 96.7 | Preferred for body text |
| #283C3E text on black | 1.80:1 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D1DBDC
oklch(88.4% 0.011 204.1)
-
Step 300
300
#B3C4C6
oklch(80.8% 0.019 205.3)
-
Step 400
400
#8BA7A9
oklch(70.8% 0.031 201.8)
-
Step 500
500
#6E9194
oklch(63.1% 0.039 202.8)
-
Step 600
600
#557B7F
oklch(55.6% 0.043 204.2)
-
Step 700
700
#45686B
oklch(49.2% 0.04 202.7)
-
Step 800
800
#395457
oklch(42.6% 0.033 204.7)
-
Step 900
900 (this color)
#283C3E
oklch(34% 0.026 203.8)
-
Step 950
950
#1D292A
oklch(27% 0.017 202.6)
#283C3E 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) | #393A3E | 0.026 |
| Deuteranopia (no green cones) | #35373E | 0.024 |
| Tritanopia (no blue cones) | #203E3D | 0.012 |
| Achromatopsia (no color) | #393939 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C3E
#283C3E
oklch(34% 0.026 203.8)
- #443332
#443332
oklch(34% 0.025 22.3)
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 #283C3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.036
- Gunmetal #293241 ΔE 0.036
- Midnight Green #073B4C ΔE 0.038
- Charcoal #264653 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.053
Use #283C3E 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.