#283C72
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.096 266.5), rgb(40, 60, 114).
Aa
White text reads best on this color (10.60:1).
About this color
#283C72 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.096 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.60:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.60:1 |
Values
| HEX | #283C72 |
| RGB | rgb(40, 60, 114) |
| HSL | hsl(224, 48%, 30%) |
| OKLCH | oklch(37% 0.096 266.5) |
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 #283C72 | 10.60:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #283C72 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #283C72 text on white | 10.60:1 | AAA | Lc 94.4 | Preferred for body text |
| #283C72 text on black | 1.97:1 | Fails | Lc -8.2 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F0
oklch(80.9% 0.072 266.3)
-
Step 400
400
#7F9EE9
oklch(70.7% 0.116 266.4)
-
Step 500
500
#6084E2
oklch(63.1% 0.147 266.5)
-
Step 600
600
#486CD0
oklch(55.7% 0.16 266.4)
-
Step 700
700
#3959B4
oklch(49% 0.149 266.4)
-
Step 800
800
#304992
oklch(42.7% 0.124 266.9)
-
Step 900
900 (this color)
#283C72
oklch(37% 0.096 266.5)
-
Step 950
950
#192544
oklch(27.1% 0.06 266.5)
#283C72 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) | #224274 | 0.018 |
| Deuteranopia (no green cones) | #173B71 | 0.019 |
| Tritanopia (no blue cones) | #004851 | 0.082 |
| Achromatopsia (no color) | #3F3F3F | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C72
#283C72
oklch(37% 0.096 266.5)
- #513C00
#513C00
oklch(36.9% 0.076 86.3)
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 #283C72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.052
- Cobalt #1E488F ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Light Navy #155084 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.065
- Marine #042E60 ΔE 0.065
Use #283C72 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.