#283D37
Closest named color: Onyx (#343A40). oklch(34% 0.029 174.8), rgb(40, 61, 55).
Aa
White text reads best on this color (11.58:1).
About this color
#283D37 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.028 away. White text reads best on it, at 11.58:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.81:1 |
| White text | 11.58:1 |
Values
| HEX | #283D37 |
| RGB | rgb(40, 61, 55) |
| HSL | hsl(163, 21%, 20%) |
| OKLCH | oklch(34% 0.029 174.8) |
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 #283D37 | 11.58:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #283D37 | 1.81:1 | Fails | Lc 0.0 | Not readable |
| #283D37 text on white | 11.58:1 | AAA | Lc 96.6 | Preferred for body text |
| #283D37 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E6EBE9
oklch(93.6% 0.006 170.4)
-
Step 200
200
#D1DCD8
oklch(88.5% 0.013 172.3)
-
Step 300
300
#B3C5C0
oklch(80.8% 0.021 177.3)
-
Step 400
400
#8BA89F
oklch(70.7% 0.035 174.5)
-
Step 500
500
#6E9388
oklch(63.2% 0.044 174.6)
-
Step 600
600
#557D72
oklch(55.7% 0.048 175.4)
-
Step 700
700
#45695F
oklch(49% 0.044 175.1)
-
Step 800
800
#39564E
oklch(42.8% 0.037 175.3)
-
Step 900
900 (this color)
#283D37
oklch(34% 0.029 174.8)
-
Step 950
950
#1D2926
oklch(26.9% 0.017 177.9)
#283D37 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) | #3C3A37 | 0.031 |
| Deuteranopia (no green cones) | #383837 | 0.028 |
| Tritanopia (no blue cones) | #223D3B | 0.010 |
| Achromatopsia (no color) | #393939 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D37
#283D37
oklch(34% 0.029 174.8)
- #443239
#443239
oklch(34% 0.028 353.5)
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 #283D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.042
- Gunmetal #293241 ΔE 0.047
- Midnight Green #073B4C ΔE 0.048
- Pakistan Green #283618 ΔE 0.048
- Charcoal #264653 ΔE 0.049
- Evergreen #05472A ΔE 0.054
Use #283D37 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.