#283D74
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.098 266.1), rgb(40, 61, 116).
Aa
White text reads best on this color (10.44:1).
About this color
#283D74 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.098 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.44:1 |
Values
| HEX | #283D74 |
| RGB | rgb(40, 61, 116) |
| HSL | hsl(223, 49%, 31%) |
| OKLCH | oklch(37.3% 0.098 266.1) |
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 #283D74 | 10.44:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #283D74 | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #283D74 text on white | 10.44:1 | AAA | Lc 94.0 | Preferred for body text |
| #283D74 text on black | 2.00:1 | Fails | Lc -8.5 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7E9EEA
oklch(70.7% 0.118 266.1)
-
Step 500
500
#5F84E4
oklch(63.1% 0.15 266.3)
-
Step 600
600
#466BD2
oklch(55.5% 0.164 266.3)
-
Step 700
700
#3859B6
oklch(49.1% 0.152 266.2)
-
Step 800
800
#2E4993
oklch(42.6% 0.126 266.1)
-
Step 900
900 (this color)
#283D74
oklch(37.3% 0.098 266.1)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#283D74 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) | #234376 | 0.017 |
| Deuteranopia (no green cones) | #163C73 | 0.019 |
| Tritanopia (no blue cones) | #004A53 | 0.083 |
| Achromatopsia (no color) | #404040 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D74
#283D74
oklch(37.3% 0.098 266.1)
- #523D00
#523D00
oklch(37.3% 0.076 86.6)
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 #283D74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.068
Use #283D74 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.