#243B60
Closest named color: Prussian Blue (#1D3557). oklch(35.3% 0.071 259.5), rgb(36, 59, 96).
Aa
White text reads best on this color (11.23:1).
About this color
#243B60 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.071 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.025 away. White text reads best on it, at 11.23:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.86:1 |
| White text | 11.23:1 |
Values
| HEX | #243B60 |
| RGB | rgb(36, 59, 96) |
| HSL | hsl(217, 45%, 26%) |
| OKLCH | oklch(35.3% 0.071 259.5) |
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 #243B60 | 11.23:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #243B60 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #243B60 text on white | 11.23:1 | AAA | Lc 95.8 | Preferred for body text |
| #243B60 text on black | 1.86:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E4
oklch(81% 0.053 260)
-
Step 400
400
#81A2D6
oklch(70.7% 0.085 259.3)
-
Step 500
500
#618ACB
oklch(63.1% 0.109 259.3)
-
Step 600
600
#4873B8
oklch(55.7% 0.118 259.5)
-
Step 700
700
#39609E
oklch(49.1% 0.109 259.3)
-
Step 800
800
#2F4E80
oklch(42.5% 0.091 259.5)
-
Step 900
900 (this color)
#243B60
oklch(35.3% 0.071 259.5)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#243B60 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) | #2C3E62 | 0.015 |
| Deuteranopia (no green cones) | #24385F | 0.009 |
| Tritanopia (no blue cones) | #004349 | 0.061 |
| Achromatopsia (no color) | #3B3B3B | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243B60
#243B60
oklch(35.3% 0.071 259.5)
- #4F3603
#4F3603
oklch(35.3% 0.071 78.9)
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 #243B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.025
- Marine Blue #01386A ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.040
- Midnight Green #073B4C ΔE 0.046
- Charcoal #264653 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.048
- Marine #042E60 ΔE 0.054
Use #243B60 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.