#283280
Closest named color: Twilight Blue (#0A437A). oklch(35.9% 0.131 272.4), rgb(40, 50, 128).
Aa
White text reads best on this color (11.30:1).
About this color
#283280 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.131 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.051 away. White text reads best on it, at 11.30:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #283280 |
| RGB | rgb(40, 50, 128) |
| HSL | hsl(233, 52%, 33%) |
| OKLCH | oklch(35.9% 0.131 272.4) |
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 #283280 | 11.30:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #283280 | 1.85:1 | Fails | Lc 8.2 | Not readable |
| #283280 text on white | 11.30:1 | AAA | Lc 95.7 | Preferred for body text |
| #283280 text on black | 1.85:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8198FF
oklch(70.7% 0.153 272.5)
-
Step 500
500
#647AFF
oklch(63.2% 0.198 272.4)
-
Step 600
600
#4E5DF0
oklch(55.6% 0.218 272.6)
-
Step 700
700
#3F4BD1
oklch(49% 0.204 272.4)
-
Step 800
800
#343FA9
oklch(42.8% 0.168 272.5)
-
Step 900
900 (this color)
#283280
oklch(35.9% 0.131 272.4)
-
Step 950
950
#1A214E
oklch(27% 0.083 273)
#283280 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) | #003E83 | 0.039 |
| Deuteranopia (no green cones) | #00377E | 0.033 |
| Tritanopia (no blue cones) | #004554 | 0.107 |
| Achromatopsia (no color) | #3A3A3A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283280
#283280
oklch(35.9% 0.131 272.4)
- #4A3B00
#4A3B00
oklch(35.8% 0.073 92.8)
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 #283280, closest first.
No curated palette has a color within ΔE 0.04 of #283280.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.051
- Marine Blue #01386A ΔE 0.054
- Cobalt #1E488F ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.063
- Marine #042E60 ΔE 0.069
- Midnight Blue #191970 ΔE 0.072
- Blueberry #464196 ΔE 0.073
- Sapphire #2138AB ΔE 0.073
Use #283280 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.