#283C84
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.123 268.3), rgb(40, 60, 132).
Aa
White text reads best on this color (10.14:1).
About this color
#283C84 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.123 and its hue 268°. 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 10.14:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.14:1 |
Values
| HEX | #283C84 |
| RGB | rgb(40, 60, 132) |
| HSL | hsl(227, 53%, 34%) |
| OKLCH | oklch(38.3% 0.123 268.3) |
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 #283C84 | 10.14:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #283C84 | 2.06:1 | Fails | Lc 10.7 | Not readable |
| #283C84 text on white | 10.14:1 | AAA | Lc 93.2 | Preferred for body text |
| #283C84 text on black | 2.06:1 | Fails | Lc -9.3 | 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
#CBD9FC
oklch(88.6% 0.051 268.1)
-
Step 300
300
#A7BFFD
oklch(80.9% 0.092 268)
-
Step 400
400
#7A9BFD
oklch(70.8% 0.148 268.4)
-
Step 500
500
#5A7EFA
oklch(63.1% 0.189 268.4)
-
Step 600
600
#4263E9
oklch(55.5% 0.206 268.3)
-
Step 700
700
#3551CB
oklch(49.1% 0.191 268.4)
-
Step 800
800
#2C43A4
oklch(42.6% 0.159 268.6)
-
Step 900
900 (this color)
#283C84
oklch(38.3% 0.123 268.3)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#283C84 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) | #0C4687 | 0.032 |
| Deuteranopia (no green cones) | #003D83 | 0.029 |
| Tritanopia (no blue cones) | #004D5A | 0.101 |
| Achromatopsia (no color) | #414141 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C84
#283C84
oklch(38.3% 0.123 268.3)
- #544000
#544000
oklch(38.2% 0.078 88.5)
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 #283C84, 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 0.036
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Light Navy #155084 ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Dusk Blue #26538D ΔE 0.065
- Sapphire #2138AB ΔE 0.065
Use #283C84 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.