#243278
Closest named color: Marine Blue (#01386A). oklch(35% 0.12 270.4), rgb(36, 50, 120).
Aa
White text reads best on this color (11.65:1).
About this color
#243278 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.120 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.041 away. White text reads best on it, at 11.65:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.65:1 |
Values
| HEX | #243278 |
| RGB | rgb(36, 50, 120) |
| HSL | hsl(230, 54%, 31%) |
| OKLCH | oklch(35% 0.12 270.4) |
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 #243278 | 11.65:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #243278 | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #243278 text on white | 11.65:1 | AAA | Lc 96.4 | Preferred for body text |
| #243278 text on black | 1.80:1 | Fails | Lc 0.0 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#AABEFC
oklch(80.9% 0.091 270.5)
-
Step 400
400
#7F9AFA
oklch(70.7% 0.144 270.5)
-
Step 500
500
#617DF7
oklch(63.1% 0.184 270.6)
-
Step 600
600
#4A63E6
oklch(55.7% 0.2 270.4)
-
Step 700
700
#3C51C8
oklch(49.2% 0.186 270.4)
-
Step 800
800
#3143A2
oklch(42.7% 0.154 270.4)
-
Step 900
900 (this color)
#243278
oklch(35% 0.12 270.4)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#243278 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) | #003C7A | 0.034 |
| Deuteranopia (no green cones) | #003577 | 0.029 |
| Tritanopia (no blue cones) | #004350 | 0.098 |
| Achromatopsia (no color) | #383838 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243278
#243278
oklch(35% 0.12 270.4)
- #493800
#493800
oklch(35% 0.071 89.7)
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 #243278, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.041
- Twilight Blue #0A437A ΔE 0.048
- Marine #042E60 ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.061
- Midnight Blue #191970 ΔE 0.066
- Cobalt #1E488F ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.073
- Royal #0C1793 ΔE 0.078
Use #243278 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.