#283A82
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.123 269.2), rgb(40, 58, 130).
Aa
White text reads best on this color (10.40:1).
About this color
#283A82 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.123 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 10.40:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.40:1 |
Values
| HEX | #283A82 |
| RGB | rgb(40, 58, 130) |
| HSL | hsl(228, 53%, 33%) |
| OKLCH | oklch(37.7% 0.123 269.2) |
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 #283A82 | 10.40:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #283A82 | 2.01:1 | Fails | Lc 10.1 | Not readable |
| #283A82 text on white | 10.40:1 | AAA | Lc 93.8 | Preferred for body text |
| #283A82 text on black | 2.01:1 | Fails | Lc -8.7 | 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
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CBD8FC
oklch(88.4% 0.052 269.6)
-
Step 300
300
#A8BFFD
oklch(81% 0.092 268.6)
-
Step 400
400
#7B9AFC
oklch(70.6% 0.148 269.1)
-
Step 500
500
#5C7EFA
oklch(63.2% 0.188 268.9)
-
Step 600
600
#4563E9
oklch(55.6% 0.205 269.1)
-
Step 700
700
#3751CB
oklch(49.2% 0.191 268.9)
-
Step 800
800
#2E43A4
oklch(42.7% 0.158 269.3)
-
Step 900
900 (this color)
#283A82
oklch(37.7% 0.123 269.2)
-
Step 950
950
#17234C
oklch(27.1% 0.077 268.6)
#283A82 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) | #074485 | 0.033 |
| Deuteranopia (no green cones) | #003C81 | 0.030 |
| Tritanopia (no blue cones) | #004B58 | 0.101 |
| Achromatopsia (no color) | #404040 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A82
#283A82
oklch(37.7% 0.123 269.2)
- #523F00
#523F00
oklch(37.8% 0.077 89.3)
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 #283A82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.052
- Marine Blue #01386A ΔE 0.055
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Sapphire #2138AB ΔE 0.068
- Dusk Blue #26538D ΔE 0.071
Use #283A82 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.