#243C68
Closest named color: Marine Blue (#01386A). oklch(36% 0.082 261.6), rgb(36, 60, 104).
Aa
White text reads best on this color (10.93:1).
About this color
#243C68 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.082 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.032 away. White text reads best on it, at 10.93:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.92:1 |
| White text | 10.93:1 |
Values
| HEX | #243C68 |
| RGB | rgb(36, 60, 104) |
| HSL | hsl(219, 49%, 27%) |
| OKLCH | oklch(36% 0.082 261.6) |
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 #243C68 | 10.93:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #243C68 | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #243C68 text on white | 10.93:1 | AAA | Lc 95.1 | Preferred for body text |
| #243C68 text on black | 1.92:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC2E9
oklch(81% 0.061 261)
-
Step 400
400
#7EA1DE
oklch(70.7% 0.098 261.2)
-
Step 500
500
#5E88D5
oklch(63.1% 0.126 261.7)
-
Step 600
600
#4471C3
oklch(55.7% 0.137 261.4)
-
Step 700
700
#365EA8
oklch(49.1% 0.127 261.5)
-
Step 800
800
#2D4D88
oklch(42.7% 0.105 261.6)
-
Step 900
900 (this color)
#243C68
oklch(36% 0.082 261.6)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#243C68 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) | #29406A | 0.015 |
| Deuteranopia (no green cones) | #1F3A67 | 0.009 |
| Tritanopia (no blue cones) | #00464D | 0.069 |
| Achromatopsia (no color) | #3D3D3D | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243C68
#243C68
oklch(36% 0.082 261.6)
- #513800
#513800
oklch(36% 0.074 80.6)
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 #243C68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.049
- Charcoal #264653 ΔE 0.055
- Marine #042E60 ΔE 0.057
- Midnight Green #073B4C ΔE 0.058
Use #243C68 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.