#243484
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.135 269.8), rgb(36, 52, 132).
Aa
White text reads best on this color (11.05:1).
About this color
#243484 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.135 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.048 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #243484 |
| RGB | rgb(36, 52, 132) |
| HSL | hsl(230, 57%, 33%) |
| OKLCH | oklch(36.4% 0.135 269.8) |
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 #243484 | 11.05:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #243484 | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #243484 text on white | 11.05:1 | AAA | Lc 95.1 | Preferred for body text |
| #243484 text on black | 1.89:1 | Fails | Lc -7.5 | 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
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C9AFF
oklch(70.8% 0.152 269.7)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#445EF4
oklch(55.6% 0.225 269.8)
-
Step 700
700
#374CD5
oklch(49.2% 0.21 269.8)
-
Step 800
800
#2D3FAC
oklch(42.6% 0.174 269.9)
-
Step 900
900 (this color)
#243484
oklch(36.4% 0.135 269.8)
-
Step 950
950
#172250
oklch(27.2% 0.085 269.8)
#243484 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) | #004087 | 0.036 |
| Deuteranopia (no green cones) | #003882 | 0.027 |
| Tritanopia (no blue cones) | #004856 | 0.110 |
| Achromatopsia (no color) | #3C3C3C | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243484
#243484
oklch(36.4% 0.135 269.8)
- #4E3C00
#4E3C00
oklch(36.5% 0.075 89.6)
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 #243484, closest first.
No curated palette has a color within ΔE 0.04 of #243484.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.048
- Marine Blue #01386A ΔE 0.055
- Cobalt #1E488F ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.063
- Sapphire #2138AB ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Royal #0C1793 ΔE 0.071
- Marine #042E60 ΔE 0.073
Use #243484 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.