#243E6B
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.084 260.7), rgb(36, 62, 107).
Aa
White text reads best on this color (10.62:1).
About this color
#243E6B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.084 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #243E6B |
| RGB | rgb(36, 62, 107) |
| HSL | hsl(218, 50%, 28%) |
| OKLCH | oklch(36.7% 0.084 260.7) |
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 #243E6B | 10.62:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #243E6B | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #243E6B text on white | 10.62:1 | AAA | Lc 94.5 | Preferred for body text |
| #243E6B text on black | 1.97:1 | Fails | Lc -8.1 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF1
oklch(88.5% 0.035 260.4)
-
Step 300
300
#AAC2EA
oklch(81% 0.063 260.6)
-
Step 400
400
#7CA1E0
oklch(70.7% 0.102 260.7)
-
Step 500
500
#5B88D7
oklch(63% 0.13 261)
-
Step 600
600
#4171C4
oklch(55.6% 0.139 260.6)
-
Step 700
700
#335EAA
oklch(49.1% 0.131 260.9)
-
Step 800
800
#2A4D89
oklch(42.6% 0.108 260.5)
-
Step 900
900 (this color)
#243E6B
oklch(36.7% 0.084 260.7)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#243E6B 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) | #2A426D | 0.015 |
| Deuteranopia (no green cones) | #203B6A | 0.011 |
| Tritanopia (no blue cones) | #00484F | 0.070 |
| Achromatopsia (no color) | #3E3E3E | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E6B
#243E6B
oklch(36.7% 0.084 260.7)
- #533A00
#533A00
oklch(36.7% 0.076 81.4)
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 #243E6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.053
- Charcoal #264653 ΔE 0.055
- Light Navy #155084 ΔE 0.062
- Midnight Green #073B4C ΔE 0.062
Use #243E6B 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.