#283A80
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.12 269.1), rgb(40, 58, 128).
Aa
White text reads best on this color (10.46:1).
About this color
#283A80 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.120 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #283A80 |
| RGB | rgb(40, 58, 128) |
| HSL | hsl(228, 52%, 33%) |
| OKLCH | oklch(37.6% 0.12 269.1) |
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 #283A80 | 10.46:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #283A80 | 2.00:1 | Fails | Lc 10.0 | Not readable |
| #283A80 text on white | 10.46:1 | AAA | Lc 94.0 | Preferred for body text |
| #283A80 text on black | 2.00:1 | Fails | Lc -8.6 | 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
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CBD9FB
oklch(88.6% 0.049 267.7)
-
Step 300
300
#A9BFFC
oklch(81% 0.09 269)
-
Step 400
400
#7C9BFA
oklch(70.7% 0.144 268.9)
-
Step 500
500
#5D7EF7
oklch(63% 0.184 269.1)
-
Step 600
600
#4664E6
oklch(55.6% 0.199 269.1)
-
Step 700
700
#3852C8
oklch(49.2% 0.185 269)
-
Step 800
800
#2E44A2
oklch(42.8% 0.154 268.9)
-
Step 900
900 (this color)
#283A80
oklch(37.6% 0.12 269.1)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#283A80 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) | #0C4482 | 0.032 |
| Deuteranopia (no green cones) | #003C7F | 0.030 |
| Tritanopia (no blue cones) | #004B57 | 0.100 |
| Achromatopsia (no color) | #3F3F3F | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A80
#283A80
oklch(37.6% 0.12 269.1)
- #523E00
#523E00
oklch(37.5% 0.077 88)
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 #283A80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.043
- Marine Blue #01386A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.053
- Blueberry #464196 ΔE 0.061
- Light Navy #155084 ΔE 0.062
- Sapphire #2138AB ΔE 0.071
- Dusk Blue #26538D ΔE 0.072
Use #283A80 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.