#243565
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.087 267.1), rgb(36, 53, 101).
Aa
White text reads best on this color (11.84:1).
About this color
#243565 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.087 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 11.84:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.84:1 |
Values
| HEX | #243565 |
| RGB | rgb(36, 53, 101) |
| HSL | hsl(224, 47%, 27%) |
| OKLCH | oklch(34.1% 0.087 267.1) |
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 #243565 | 11.84:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #243565 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #243565 text on white | 11.84:1 | AAA | Lc 97.0 | Preferred for body text |
| #243565 text on black | 1.77:1 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#AEC0EC
oklch(80.9% 0.066 267.5)
-
Step 400
400
#839EE2
oklch(70.6% 0.105 267.1)
-
Step 500
500
#6585DA
oklch(63.1% 0.133 267)
-
Step 600
600
#4D6DC7
oklch(55.6% 0.144 267)
-
Step 700
700
#3E5AAC
oklch(48.9% 0.135 267.1)
-
Step 800
800
#334A8C
oklch(42.6% 0.113 267.1)
-
Step 900
900 (this color)
#243565
oklch(34.1% 0.087 267.1)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#243565 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) | #1F3A67 | 0.015 |
| Deuteranopia (no green cones) | #153564 | 0.017 |
| Tritanopia (no blue cones) | #004048 | 0.075 |
| Achromatopsia (no color) | #373737 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243565
#243565
oklch(34.1% 0.087 267.1)
- #483500
#483500
oklch(34.1% 0.07 86.3)
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 #243565, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.028
- Marine #042E60 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.051
- Midnight Green #073B4C ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.062
Use #243565 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.