#243786
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.134 268.7), rgb(36, 55, 134).
Aa
White text reads best on this color (10.68:1).
About this color
#243786 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.134 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #243786 |
| RGB | rgb(36, 55, 134) |
| HSL | hsl(228, 58%, 33%) |
| OKLCH | oklch(37.2% 0.134 268.7) |
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 #243786 | 10.68:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #243786 | 1.96:1 | Fails | Lc 9.6 | Not readable |
| #243786 text on white | 10.68:1 | AAA | Lc 94.3 | Preferred for body text |
| #243786 text on black | 1.96:1 | Fails | Lc -8.2 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#405FF3
oklch(55.5% 0.224 268.7)
-
Step 700
700
#334DD4
oklch(49% 0.208 268.7)
-
Step 800
800
#2A40AB
oklch(42.6% 0.172 268.8)
-
Step 900
900 (this color)
#243786
oklch(37.2% 0.134 268.7)
-
Step 950
950
#16224F
oklch(27% 0.084 268.9)
#243786 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) | #004389 | 0.036 |
| Deuteranopia (no green cones) | #003A84 | 0.026 |
| Tritanopia (no blue cones) | #004A59 | 0.106 |
| Achromatopsia (no color) | #3E3E3E | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243786
#243786
oklch(37.2% 0.134 268.7)
- #513D00
#513D00
oklch(37.2% 0.076 87.7)
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 #243786, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Cobalt #1E488F ΔE 0.047
- Marine Blue #01386A ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.058
- Sapphire #2138AB ΔE 0.061
- Blueberry #464196 ΔE 0.064
- Light Navy #155084 ΔE 0.070
- Royal #0C1793 ΔE 0.077
Use #243786 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.