#283166
Closest named color: Prussian Blue (#1D3557). oklch(33.6% 0.093 273.1), rgb(40, 49, 102).
Aa
White text reads best on this color (12.19:1).
About this color
#283166 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.093 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.034 away. White text reads best on it, at 12.19:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.19:1 |
Values
| HEX | #283166 |
| RGB | rgb(40, 49, 102) |
| HSL | hsl(231, 44%, 28%) |
| OKLCH | oklch(33.6% 0.093 273.1) |
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 #283166 | 12.19:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #283166 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #283166 text on white | 12.19:1 | AAA | Lc 97.6 | Preferred for body text |
| #283166 text on black | 1.72:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B1BEEE
oklch(80.8% 0.07 272.9)
-
Step 400
400
#8A9BE6
oklch(70.6% 0.112 273.5)
-
Step 500
500
#6E81DF
oklch(63.1% 0.143 273.1)
-
Step 600
600
#5768CD
oklch(55.6% 0.156 273.1)
-
Step 700
700
#4856B1
oklch(49.1% 0.144 273.3)
-
Step 800
800
#3B478F
oklch(42.7% 0.119 273.2)
-
Step 900
900 (this color)
#283166
oklch(33.6% 0.093 273.1)
-
Step 950
950
#1D2443
oklch(27.1% 0.058 272.4)
#283166 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) | #173868 | 0.026 |
| Deuteranopia (no green cones) | #0D3365 | 0.029 |
| Tritanopia (no blue cones) | #023D46 | 0.083 |
| Achromatopsia (no color) | #353535 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283166
#283166
oklch(33.6% 0.093 273.1)
- #433500
#433500
oklch(33.5% 0.068 92.5)
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 #283166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.034
- Marine Blue #01386A ΔE 0.036
- Marine #042E60 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.063
- Gunmetal #293241 ΔE 0.067
- Midnight Green #073B4C ΔE 0.069
Use #283166 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.