#243D6E
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.09 262.5), rgb(36, 61, 110).
Aa
White text reads best on this color (10.67:1).
About this color
#243D6E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.090 and its hue 262°. 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 10.67:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #243D6E |
| RGB | rgb(36, 61, 110) |
| HSL | hsl(220, 51%, 29%) |
| OKLCH | oklch(36.7% 0.09 262.5) |
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 #243D6E | 10.67:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #243D6E | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #243D6E text on white | 10.67:1 | AAA | Lc 94.5 | Preferred for body text |
| #243D6E text on black | 1.96:1 | Fails | Lc -8.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7CA0E4
oklch(70.7% 0.108 262.5)
-
Step 500
500
#5B87DD
oklch(63.1% 0.139 262.6)
-
Step 600
600
#416FCA
oklch(55.6% 0.15 262.4)
-
Step 700
700
#335CAF
oklch(49% 0.14 262.6)
-
Step 800
800
#2B4C8E
oklch(42.8% 0.116 262.6)
-
Step 900
900 (this color)
#243D6E
oklch(36.7% 0.09 262.5)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#243D6E 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) | #274270 | 0.016 |
| Deuteranopia (no green cones) | #1B3B6D | 0.012 |
| Tritanopia (no blue cones) | #004850 | 0.075 |
| Achromatopsia (no color) | #3E3E3E | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D6E
#243D6E
oklch(36.7% 0.09 262.5)
- #523A00
#523A00
oklch(36.6% 0.075 82.4)
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 #243D6E, 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 0.034
- Prussian Blue #1D3557 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Charcoal #264653 ΔE 0.061
- Light Navy #155084 ΔE 0.061
Use #243D6E 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.