#243458
Closest named color: Prussian Blue (#1D3557). oklch(33% 0.067 264.8), rgb(36, 52, 88).
Aa
White text reads best on this color (12.30:1).
About this color
#243458 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.067 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.009 away. White text reads best on it, at 12.30:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.70:1 |
| White text | 12.30:1 |
Values
| HEX | #243458 |
| RGB | rgb(36, 52, 88) |
| HSL | hsl(222, 42%, 24%) |
| OKLCH | oklch(33% 0.067 264.8) |
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 #243458 | 12.30:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #243458 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #243458 text on white | 12.30:1 | AAA | Lc 97.9 | Preferred for body text |
| #243458 text on black | 1.70:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B1C1E2
oklch(81% 0.05 264.8)
-
Step 400
400
#88A0D4
oklch(70.7% 0.081 265.2)
-
Step 500
500
#6A88C8
oklch(63.1% 0.103 264.5)
-
Step 600
600
#5271B5
oklch(55.6% 0.112 264.5)
-
Step 700
700
#435E9C
oklch(49.1% 0.105 265)
-
Step 800
800
#374D7E
oklch(42.6% 0.086 264.7)
-
Step 900
900 (this color)
#243458
oklch(33% 0.067 264.8)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#243458 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) | #253759 | 0.010 |
| Deuteranopia (no green cones) | #1F3357 | 0.008 |
| Tritanopia (no blue cones) | #073C41 | 0.061 |
| Achromatopsia (no color) | #353535 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243458
#243458
oklch(33% 0.067 264.8)
- #453200
#453200
oklch(33% 0.068 85.3)
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 #243458, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.009
- Dark Blue Grey #1F3B4D ΔE 0.034
- Marine Blue #01386A ΔE 0.040
- Gunmetal #293241 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.041
- Marine #042E60 ΔE 0.041
- Midnight Green #073B4C ΔE 0.043
- Onyx #343A40 ΔE 0.057
Use #243458 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.