#243369
Closest named color: Marine Blue (#01386A). oklch(34% 0.096 269.1), rgb(36, 51, 105).
Aa
White text reads best on this color (11.98:1).
About this color
#243369 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.096 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.029 away. White text reads best on it, at 11.98:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.98:1 |
Values
| HEX | #243369 |
| RGB | rgb(36, 51, 105) |
| HSL | hsl(227, 49%, 28%) |
| OKLCH | oklch(34% 0.096 269.1) |
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 #243369 | 11.98:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #243369 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #243369 text on white | 11.98:1 | AAA | Lc 97.2 | Preferred for body text |
| #243369 text on black | 1.75:1 | Fails | Lc 0.0 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ADBFF0
oklch(80.8% 0.072 269)
-
Step 400
400
#839DE9
oklch(70.7% 0.116 268.9)
-
Step 500
500
#6583E2
oklch(63.2% 0.147 268.7)
-
Step 600
600
#4E6AD0
oklch(55.6% 0.16 269.1)
-
Step 700
700
#3F58B4
oklch(49.2% 0.149 268.9)
-
Step 800
800
#344892
oklch(42.7% 0.124 269.2)
-
Step 900
900 (this color)
#243369
oklch(34% 0.096 269.1)
-
Step 950
950
#1A2444
oklch(26.9% 0.061 268.9)
#243369 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) | #173A6B | 0.023 |
| Deuteranopia (no green cones) | #093468 | 0.025 |
| Tritanopia (no blue cones) | #003F49 | 0.081 |
| Achromatopsia (no color) | #373737 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243369
#243369
oklch(34% 0.096 269.1)
- #463500
#463500
oklch(33.8% 0.069 88.8)
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 #243369, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.035
- Marine #042E60 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.061
- Midnight Green #073B4C ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.070
Use #243369 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.