#243B69
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.085 262.8), rgb(36, 59, 105).
Aa
White text reads best on this color (11.02:1).
About this color
#243B69 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.085 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 11.02:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #243B69 |
| RGB | rgb(36, 59, 105) |
| HSL | hsl(220, 49%, 28%) |
| OKLCH | oklch(35.9% 0.085 262.8) |
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 #243B69 | 11.02:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #243B69 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #243B69 text on white | 11.02:1 | AAA | Lc 95.3 | Preferred for body text |
| #243B69 text on black | 1.90:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1EB
oklch(80.9% 0.064 263.3)
-
Step 400
400
#7FA0E1
oklch(70.7% 0.103 263.3)
-
Step 500
500
#5E87D8
oklch(63% 0.131 262.9)
-
Step 600
600
#4570C5
oklch(55.7% 0.141 262.5)
-
Step 700
700
#375DAB
oklch(49.2% 0.132 262.9)
-
Step 800
800
#2E4C8A
oklch(42.7% 0.109 263.1)
-
Step 900
900 (this color)
#243B69
oklch(35.9% 0.085 262.8)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#243B69 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) | #263F6B | 0.013 |
| Deuteranopia (no green cones) | #1C3968 | 0.012 |
| Tritanopia (no blue cones) | #00454D | 0.071 |
| Achromatopsia (no color) | #3C3C3C | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243B69
#243B69
oklch(35.9% 0.085 262.8)
- #4F3800
#4F3800
oklch(35.7% 0.073 82.8)
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 #243B69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.051
- Marine #042E60 ΔE 0.055
- Charcoal #264653 ΔE 0.059
- Midnight Green #073B4C ΔE 0.060
Use #243B69 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.