#243778
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.114 268), rgb(36, 55, 120).
Aa
White text reads best on this color (11.09:1).
About this color
#243778 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 268°. 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 11.09:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #243778 |
| RGB | rgb(36, 55, 120) |
| HSL | hsl(226, 54%, 31%) |
| OKLCH | oklch(36.1% 0.114 268) |
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 #243778 | 11.09:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #243778 | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #243778 text on white | 11.09:1 | AAA | Lc 95.3 | Preferred for body text |
| #243778 text on black | 1.89:1 | Fails | Lc -7.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9BFF9
oklch(80.9% 0.086 268.4)
-
Step 400
400
#7C9CF5
oklch(70.7% 0.136 267.9)
-
Step 500
500
#5D80F2
oklch(63.1% 0.175 268.2)
-
Step 600
600
#4566E0
oklch(55.5% 0.189 268.2)
-
Step 700
700
#3754C3
oklch(49.1% 0.177 268.1)
-
Step 800
800
#2D469D
oklch(42.7% 0.145 267.7)
-
Step 900
900 (this color)
#243778
oklch(36.1% 0.114 268)
-
Step 950
950
#172349
oklch(26.8% 0.072 268.1)
#243778 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) | #0E407A | 0.028 |
| Deuteranopia (no green cones) | #003877 | 0.027 |
| Tritanopia (no blue cones) | #004652 | 0.092 |
| Achromatopsia (no color) | #3C3C3C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243778
#243778
oklch(36.1% 0.114 268)
- #4D3A00
#4D3A00
oklch(35.9% 0.073 87.9)
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 #243778, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Marine Blue #01386A ΔE 0.038
- Cobalt #1E488F ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.059
- Marine #042E60 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.066
- Light Navy #155084 ΔE 0.072
- Dark Grey Blue #29465B ΔE 0.075
Use #243778 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.