#243689
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.14 269.1), rgb(36, 54, 137).
Aa
White text reads best on this color (10.69:1).
About this color
#243689 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.140 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.048 away. White text reads best on it, at 10.69:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #243689 |
| RGB | rgb(36, 54, 137) |
| HSL | hsl(229, 58%, 34%) |
| OKLCH | oklch(37.3% 0.14 269.1) |
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 #243689 | 10.69:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #243689 | 1.96:1 | Fails | Lc 9.6 | Not readable |
| #243689 text on white | 10.69:1 | AAA | Lc 94.3 | Preferred for body text |
| #243689 text on black | 1.96:1 | Fails | Lc -8.3 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#405DF9
oklch(55.7% 0.233 269)
-
Step 700
700
#344BD9
oklch(49.2% 0.217 269.2)
-
Step 800
800
#2A3FAF
oklch(42.8% 0.179 269)
-
Step 900
900 (this color)
#243689
oklch(37.3% 0.14 269.1)
-
Step 950
950
#152151
oklch(26.9% 0.089 269)
#243689 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) | #00438C | 0.037 |
| Deuteranopia (no green cones) | #003A87 | 0.026 |
| Tritanopia (no blue cones) | #004B5A | 0.112 |
| Achromatopsia (no color) | #3E3E3E | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243689
#243689
oklch(37.3% 0.14 269.1)
- #513E00
#513E00
oklch(37.4% 0.076 89.1)
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 #243689, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.048
- Cobalt #1E488F ΔE 0.048
- Sapphire #2138AB ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
- Marine Blue #01386A ΔE 0.062
- Blueberry #464196 ΔE 0.063
- Royal #0C1793 ΔE 0.073
- Light Navy #155084 ΔE 0.073
Use #243689 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.