#283579
Closest named color: Twilight Blue (#0A437A). oklch(35.9% 0.117 271.2), rgb(40, 53, 121).
Aa
White text reads best on this color (11.19:1).
About this color
#283579 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.117 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 11.19:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.87:1 |
| White text | 11.19:1 |
Values
| HEX | #283579 |
| RGB | rgb(40, 53, 121) |
| HSL | hsl(230, 50%, 32%) |
| OKLCH | oklch(35.9% 0.117 271.2) |
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 #283579 | 11.19:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #283579 | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #283579 text on white | 11.19:1 | AAA | Lc 95.6 | Preferred for body text |
| #283579 text on black | 1.87:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF7
oklch(70.7% 0.139 271.1)
-
Step 500
500
#647DF4
oklch(63% 0.179 271.5)
-
Step 600
600
#4D63E3
oklch(55.6% 0.195 271.2)
-
Step 700
700
#3F51C5
oklch(49.1% 0.181 271.4)
-
Step 800
800
#33439F
oklch(42.6% 0.15 271.1)
-
Step 900
900 (this color)
#283579
oklch(35.9% 0.117 271.2)
-
Step 950
950
#1A234A
oklch(27.1% 0.073 271.1)
#283579 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) | #053F7B | 0.035 |
| Deuteranopia (no green cones) | #003878 | 0.032 |
| Tritanopia (no blue cones) | #004551 | 0.098 |
| Achromatopsia (no color) | #3B3B3B | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283579
#283579
oklch(35.9% 0.117 271.2)
- #4B3B00
#4B3B00
oklch(35.9% 0.073 91.6)
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 #283579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.044
- Cobalt #1E488F ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.062
- Marine #042E60 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
- Blueberry #464196 ΔE 0.075
- Light Navy #155084 ΔE 0.076
Use #283579 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.