#243375
Closest named color: Marine Blue (#01386A). oklch(34.9% 0.115 269.9), rgb(36, 51, 117).
Aa
White text reads best on this color (11.63:1).
About this color
#243375 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.115 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.037 away. White text reads best on it, at 11.63:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.63:1 |
Values
| HEX | #243375 |
| RGB | rgb(36, 51, 117) |
| HSL | hsl(229, 53%, 30%) |
| OKLCH | oklch(34.9% 0.115 269.9) |
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 #243375 | 11.63:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #243375 | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #243375 text on white | 11.63:1 | AAA | Lc 96.4 | Preferred for body text |
| #243375 text on black | 1.80:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBFF9
oklch(81% 0.085 269.7)
-
Step 400
400
#7F9BF6
oklch(70.7% 0.137 269.7)
-
Step 500
500
#617FF2
oklch(63.1% 0.175 269.8)
-
Step 600
600
#4A65E1
oklch(55.7% 0.191 269.9)
-
Step 700
700
#3C53C3
oklch(49.1% 0.176 269.9)
-
Step 800
800
#31449E
oklch(42.6% 0.148 270)
-
Step 900
900 (this color)
#243375
oklch(34.9% 0.115 269.9)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#243375 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) | #043C77 | 0.032 |
| Deuteranopia (no green cones) | #003574 | 0.029 |
| Tritanopia (no blue cones) | #00434E | 0.096 |
| Achromatopsia (no color) | #393939 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243375
#243375
oklch(34.9% 0.115 269.9)
- #493800
#493800
oklch(35% 0.071 89.7)
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 #243375, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.037
- Twilight Blue #0A437A ΔE 0.046
- Marine #042E60 ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.055
- Midnight Blue #191970 ΔE 0.068
- Cobalt #1E488F ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.079
Use #243375 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.