#243289
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.145 270.4), rgb(36, 50, 137).
Aa
White text reads best on this color (11.09:1).
About this color
#243289 is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.145 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.055 away. White text reads best on it, at 11.09:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #243289 |
| RGB | rgb(36, 50, 137) |
| HSL | hsl(232, 58%, 34%) |
| OKLCH | oklch(36.5% 0.145 270.4) |
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 #243289 | 11.09:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #243289 | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #243289 text on white | 11.09:1 | AAA | Lc 95.1 | Preferred for body text |
| #243289 text on black | 1.89:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4459FD
oklch(55.5% 0.242 270.4)
-
Step 700
700
#3747DD
oklch(49.1% 0.225 270.4)
-
Step 800
800
#2D3CB2
oklch(42.6% 0.186 270.4)
-
Step 900
900 (this color)
#243289
oklch(36.5% 0.145 270.4)
-
Step 950
950
#162052
oklch(26.8% 0.092 270.5)
#243289 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) | #00408C | 0.039 |
| Deuteranopia (no green cones) | #003787 | 0.028 |
| Tritanopia (no blue cones) | #004858 | 0.116 |
| Achromatopsia (no color) | #3C3C3C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243289
#243289
oklch(36.5% 0.145 270.4)
- #4D3C00
#4D3C00
oklch(36.4% 0.074 90.7)
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 #243289, closest first.
No curated palette has a color within ΔE 0.04 of #243289.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.055
- Cobalt #1E488F ΔE 0.058
- Sapphire #2138AB ΔE 0.058
- Marine Blue #01386A ΔE 0.063
- Royal #0C1793 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Midnight Blue #191970 ΔE 0.077
Use #243289 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.