#243D7F
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.116 265.6), rgb(36, 61, 127).
Aa
White text reads best on this color (10.24:1).
About this color
#243D7F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.116 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 10.24:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.24:1 |
Values
| HEX | #243D7F |
| RGB | rgb(36, 61, 127) |
| HSL | hsl(224, 56%, 32%) |
| OKLCH | oklch(37.9% 0.116 265.6) |
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 #243D7F | 10.24:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #243D7F | 2.04:1 | Fails | Lc 10.5 | Not readable |
| #243D7F text on white | 10.24:1 | AAA | Lc 93.5 | Preferred for body text |
| #243D7F text on black | 2.04:1 | Fails | Lc -9.0 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#779DF7
oklch(70.7% 0.139 265.7)
-
Step 500
500
#5582F4
oklch(63.2% 0.178 265.4)
-
Step 600
600
#3C68E2
oklch(55.6% 0.192 265.5)
-
Step 700
700
#2F55C5
oklch(49.1% 0.18 265.7)
-
Step 800
800
#27479F
oklch(42.8% 0.148 265.4)
-
Step 900
900 (this color)
#243D7F
oklch(37.9% 0.116 265.6)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#243D7F 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) | #174581 | 0.023 |
| Deuteranopia (no green cones) | #003D7E | 0.025 |
| Tritanopia (no blue cones) | #004D58 | 0.095 |
| Achromatopsia (no color) | #414141 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D7F
#243D7F
oklch(37.9% 0.116 265.6)
- #553E00
#553E00
oklch(37.9% 0.078 84.8)
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 #243D7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Cobalt #1E488F ΔE 0.038
- Marine Blue #01386A ΔE 0.049
- Light Navy #155084 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.066
Use #243D7F 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.