#242F81
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.137 271.5), rgb(36, 47, 129).
Aa
White text reads best on this color (11.67:1).
About this color
#242F81 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.137 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.055 away. White text reads best on it, at 11.67:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #242F81 |
| RGB | rgb(36, 47, 129) |
| HSL | hsl(233, 56%, 32%) |
| OKLCH | oklch(35.2% 0.137 271.5) |
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 #242F81 | 11.67:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #242F81 | 1.79:1 | Fails | Lc 7.5 | Not readable |
| #242F81 text on white | 11.67:1 | AAA | Lc 96.3 | Preferred for body text |
| #242F81 text on black | 1.79:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#495BF6
oklch(55.5% 0.23 271.5)
-
Step 700
700
#3C49D6
oklch(49% 0.213 271.7)
-
Step 800
800
#313EAD
oklch(42.8% 0.176 271.5)
-
Step 900
900 (this color)
#242F81
oklch(35.2% 0.137 271.5)
-
Step 950
950
#182150
oklch(27% 0.087 271.3)
#242F81 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) | #003D84 | 0.040 |
| Deuteranopia (no green cones) | #00347F | 0.029 |
| Tritanopia (no blue cones) | #004453 | 0.111 |
| Achromatopsia (no color) | #383838 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #242F81
#242F81
oklch(35.2% 0.137 271.5)
- #493900
#493900
oklch(35.2% 0.072 91.1)
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 #242F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.055
- Twilight Blue #0A437A ΔE 0.057
- Royal #0C1793 ΔE 0.064
- Midnight Blue #191970 ΔE 0.064
- Marine #042E60 ΔE 0.067
- Cobalt #1E488F ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.072
- Sapphire #2138AB ΔE 0.073
Use #242F81 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.