#283B33
Closest named color: Onyx (#343A40). oklch(33.3% 0.028 166.7), rgb(40, 59, 51).
Aa
White text reads best on this color (11.90:1).
About this color
#283B33 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.032 away. White text reads best on it, at 11.90:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #283B33 |
| RGB | rgb(40, 59, 51) |
| HSL | hsl(155, 19%, 19%) |
| OKLCH | oklch(33.3% 0.028 166.7) |
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 #283B33 | 11.90:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #283B33 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #283B33 text on white | 11.90:1 | AAA | Lc 97.3 | Preferred for body text |
| #283B33 text on black | 1.76:1 | 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
#E6EBE9
oklch(93.6% 0.006 170.4)
-
Step 200
200
#D2DCD7
oklch(88.5% 0.013 164.8)
-
Step 300
300
#B4C5BE
oklch(80.8% 0.021 169.2)
-
Step 400
400
#8DA89C
oklch(70.7% 0.035 166.7)
-
Step 500
500
#719284
oklch(63.1% 0.043 167.2)
-
Step 600
600
#587C6D
oklch(55.4% 0.047 167)
-
Step 700
700
#48695B
oklch(49.1% 0.044 166.4)
-
Step 800
800
#3C564B
oklch(42.9% 0.036 166.6)
-
Step 900
900 (this color)
#283B33
oklch(33.3% 0.028 166.7)
-
Step 950
950
#1E2924
oklch(26.9% 0.018 165.6)
#283B33 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) | #3A3833 | 0.029 |
| Deuteranopia (no green cones) | #373633 | 0.027 |
| Tritanopia (no blue cones) | #243B39 | 0.011 |
| Achromatopsia (no color) | #373737 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B33
#283B33
oklch(33.3% 0.028 166.7)
- #413039
#413039
oklch(33.2% 0.029 345.7)
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 #283B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.032
- Pakistan Green #283618 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.045
- Gunmetal #293241 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.047
- Midnight Green #073B4C ΔE 0.051
- Evergreen #05472A ΔE 0.055
- Charcoal #264653 ΔE 0.057
Use #283B33 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.