#283684
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.131 270.9), rgb(40, 54, 132).
Aa
White text reads best on this color (10.76:1).
About this color
#283684 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.131 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #283684 |
| RGB | rgb(40, 54, 132) |
| HSL | hsl(231, 53%, 34%) |
| OKLCH | oklch(37.1% 0.131 270.9) |
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 #283684 | 10.76:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #283684 | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #283684 text on white | 10.76:1 | AAA | Lc 94.5 | Preferred for body text |
| #283684 text on black | 1.95:1 | Fails | Lc -8.0 | 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
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#495EF1
oklch(55.6% 0.22 271)
-
Step 700
700
#3B4CD1
oklch(49% 0.203 271)
-
Step 800
800
#3040A9
oklch(42.7% 0.168 270.8)
-
Step 900
900 (this color)
#283684
oklch(37.1% 0.131 270.9)
-
Step 950
950
#18224E
oklch(27.1% 0.082 270.4)
#283684 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) | #004287 | 0.038 |
| Deuteranopia (no green cones) | #003A82 | 0.031 |
| Tritanopia (no blue cones) | #004957 | 0.108 |
| Achromatopsia (no color) | #3E3E3E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283684
#283684
oklch(37.1% 0.131 270.9)
- #4F3E00
#4F3E00
oklch(37.1% 0.076 91.2)
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 #283684, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Cobalt #1E488F ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.057
- Blueberry #464196 ΔE 0.063
- Sapphire #2138AB ΔE 0.065
- Light Navy #155084 ΔE 0.072
- Marine #042E60 ΔE 0.077
Use #283684 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.