#243D65
Closest named color: Prussian Blue (#1D3557). oklch(36.1% 0.076 259.4), rgb(36, 61, 101).
Aa
White text reads best on this color (10.87:1).
About this color
#243D65 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.076 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.034 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #243D65 |
| RGB | rgb(36, 61, 101) |
| HSL | hsl(217, 47%, 27%) |
| OKLCH | oklch(36.1% 0.076 259.4) |
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 #243D65 | 10.87:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #243D65 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #243D65 text on white | 10.87:1 | AAA | Lc 95.0 | Preferred for body text |
| #243D65 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ABC2E6
oklch(80.9% 0.057 259.3)
-
Step 400
400
#7EA2DA
oklch(70.7% 0.092 259)
-
Step 500
500
#5E8AD0
oklch(63.2% 0.117 259.4)
-
Step 600
600
#4472BD
oklch(55.6% 0.128 259.7)
-
Step 700
700
#355FA3
oklch(49% 0.119 259.6)
-
Step 800
800
#2D4E84
oklch(42.7% 0.098 259.8)
-
Step 900
900 (this color)
#243D65
oklch(36.1% 0.076 259.4)
-
Step 950
950
#18263E
oklch(26.9% 0.049 260.7)
#243D65 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) | #2C4067 | 0.015 |
| Deuteranopia (no green cones) | #233A64 | 0.009 |
| Tritanopia (no blue cones) | #00464C | 0.065 |
| Achromatopsia (no color) | #3D3D3D | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D65
#243D65
oklch(36.1% 0.076 259.4)
- #523800
#523800
oklch(36.1% 0.075 79.6)
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 #243D65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.034
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.038
- Twilight Blue #0A437A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.043
- Charcoal #264653 ΔE 0.049
- Midnight Green #073B4C ΔE 0.053
- Marine #042E60 ΔE 0.059
Use #243D65 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.