#283C39
Closest named color: Onyx (#343A40). oklch(33.8% 0.026 184.5), rgb(40, 60, 57).
Aa
White text reads best on this color (11.69:1).
About this color
#283C39 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 0.024 away. White text reads best on it, at 11.69:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #283C39 |
| RGB | rgb(40, 60, 57) |
| HSL | hsl(171, 20%, 20%) |
| OKLCH | oklch(33.8% 0.026 184.5) |
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 #283C39 | 11.69:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #283C39 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #283C39 text on white | 11.69:1 | AAA | Lc 96.9 | Preferred for body text |
| #283C39 text on black | 1.79:1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D2DCDA
oklch(88.6% 0.011 182.8)
-
Step 300
300
#B3C5C2
oklch(80.9% 0.02 184.8)
-
Step 400
400
#8CA7A3
oklch(70.7% 0.03 185.6)
-
Step 500
500
#6F928C
oklch(63.2% 0.04 183.4)
-
Step 600
600
#567C76
oklch(55.6% 0.044 183.8)
-
Step 700
700
#466863
oklch(49% 0.04 184.5)
-
Step 800
800
#3A5551
oklch(42.7% 0.033 184.6)
-
Step 900
900 (this color)
#283C39
oklch(33.8% 0.026 184.5)
-
Step 950
950
#1D2927
oklch(26.9% 0.017 183.7)
#283C39 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) | #3A3A39 | 0.028 |
| Deuteranopia (no green cones) | #363739 | 0.026 |
| Tritanopia (no blue cones) | #223D3B | 0.008 |
| Achromatopsia (no color) | #383838 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C39
#283C39
oklch(33.8% 0.026 184.5)
- #443236
#443236
oklch(33.9% 0.027 3.8)
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 #283C39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.039
- Gunmetal #293241 ΔE 0.041
- Midnight Green #073B4C ΔE 0.044
- Charcoal #264653 ΔE 0.048
- Pakistan Green #283618 ΔE 0.051
- Dark Teal #014D4E ΔE 0.058
Use #283C39 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.