#243F6D
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.086 260.4), rgb(36, 63, 109).
Aa
White text reads best on this color (10.46:1).
About this color
#243F6D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.028 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #243F6D |
| RGB | rgb(36, 63, 109) |
| HSL | hsl(218, 50%, 28%) |
| OKLCH | oklch(37.1% 0.086 260.4) |
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 #243F6D | 10.46:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #243F6D | 2.00:1 | Fails | Lc 9.8 | Not readable |
| #243F6D text on white | 10.46:1 | AAA | Lc 94.1 | Preferred for body text |
| #243F6D text on black | 2.00:1 | Fails | Lc -8.5 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF1
oklch(88.5% 0.035 260.4)
-
Step 300
300
#A9C2EB
oklch(80.9% 0.064 260.3)
-
Step 400
400
#7BA1E1
oklch(70.7% 0.103 260.5)
-
Step 500
500
#5988D9
oklch(63% 0.133 260.7)
-
Step 600
600
#3F71C6
oklch(55.7% 0.143 260.3)
-
Step 700
700
#315EAB
oklch(49.1% 0.133 260.4)
-
Step 800
800
#294D8B
oklch(42.7% 0.111 260.5)
-
Step 900
900 (this color)
#243F6D
oklch(37.1% 0.086 260.4)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#243F6D 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) | #2B436F | 0.016 |
| Deuteranopia (no green cones) | #203C6C | 0.011 |
| Tritanopia (no blue cones) | #004950 | 0.071 |
| Achromatopsia (no color) | #3F3F3F | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F6D
#243F6D
oklch(37.1% 0.086 260.4)
- #553B00
#553B00
oklch(37.2% 0.077 80.7)
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 #243F6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.028
- Marine Blue #01386A ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.047
- Charcoal #264653 ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.056
- Light Navy #155084 ΔE 0.057
- Cobalt #1E488F ΔE 0.059
Use #243F6D 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.