#283B44
Closest named color: Onyx (#343A40). oklch(34% 0.029 228.9), rgb(40, 59, 68).
Aa
White text reads best on this color (11.67:1).
About this color
#283B44 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 0.018 away. White text reads best on it, at 11.67:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #283B44 |
| RGB | rgb(40, 59, 68) |
| HSL | hsl(199, 26%, 21%) |
| OKLCH | oklch(34% 0.029 228.9) |
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 #283B44 | 11.67:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #283B44 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #283B44 text on white | 11.67:1 | AAA | Lc 96.8 | Preferred for body text |
| #283B44 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B3C4CC
oklch(81% 0.022 227.6)
-
Step 400
400
#8BA5B2
oklch(70.6% 0.035 229.5)
-
Step 500
500
#6E8F9F
oklch(63.1% 0.044 229.1)
-
Step 600
600
#55798A
oklch(55.5% 0.048 228.9)
-
Step 700
700
#456675
oklch(49.1% 0.045 228.1)
-
Step 800
800
#39535F
oklch(42.6% 0.037 228.3)
-
Step 900
900 (this color)
#283B44
oklch(34% 0.029 228.9)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#283B44 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) | #363A44 | 0.021 |
| Deuteranopia (no green cones) | #323744 | 0.019 |
| Tritanopia (no blue cones) | #1E3E3E | 0.021 |
| Achromatopsia (no color) | #383838 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B44
#283B44
oklch(34% 0.029 228.9)
- #45342B
#45342B
oklch(34.1% 0.029 49.2)
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 #283B44, 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 0.019
- Gunmetal #293241 ΔE 0.029
- Midnight Green #073B4C ΔE 0.032
- Charcoal #264653 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.046
Use #283B44 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.