#243E6E
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.089 261.6), rgb(36, 62, 110).
Aa
White text reads best on this color (10.55:1).
About this color
#243E6E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.089 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #243E6E |
| RGB | rgb(36, 62, 110) |
| HSL | hsl(219, 51%, 29%) |
| OKLCH | oklch(36.9% 0.089 261.6) |
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 #243E6E | 10.55:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #243E6E | 1.98:1 | Fails | Lc 9.6 | Not readable |
| #243E6E text on white | 10.55:1 | AAA | Lc 94.3 | Preferred for body text |
| #243E6E text on black | 1.98:1 | Fails | Lc -8.3 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#A9C2EC
oklch(81% 0.066 260.7)
-
Step 400
400
#7BA1E3
oklch(70.8% 0.106 261.1)
-
Step 500
500
#5A88DB
oklch(63.2% 0.135 261.4)
-
Step 600
600
#4070C9
oklch(55.7% 0.148 261.5)
-
Step 700
700
#325DAE
oklch(49.1% 0.138 261.7)
-
Step 800
800
#2A4C8D
oklch(42.7% 0.115 262)
-
Step 900
900 (this color)
#243E6E
oklch(36.9% 0.089 261.6)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#243E6E 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) | #284370 | 0.017 |
| Deuteranopia (no green cones) | #1D3C6D | 0.011 |
| Tritanopia (no blue cones) | #004950 | 0.075 |
| Achromatopsia (no color) | #3F3F3F | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E6E
#243E6E
oklch(36.9% 0.089 261.6)
- #543B00
#543B00
oklch(37.1% 0.076 81.7)
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 #243E6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.058
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.059
- Charcoal #264653 ΔE 0.059
Use #243E6E 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.