#243451
Closest named color: Prussian Blue (#1D3557). oklch(32.6% 0.056 261.7), rgb(36, 52, 81).
Aa
White text reads best on this color (12.46:1).
About this color
#243451 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.056 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.013 away. White text reads best on it, at 12.46:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.46:1 |
Values
| HEX | #243451 |
| RGB | rgb(36, 52, 81) |
| HSL | hsl(219, 38%, 23%) |
| OKLCH | oklch(32.6% 0.056 261.7) |
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 #243451 | 12.46:1 | AAA | Lc -101.7 | Preferred for body text |
| Black text on #243451 | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #243451 text on white | 12.46:1 | AAA | Lc 98.3 | Preferred for body text |
| #243451 text on black | 1.68:1 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D1DAE9
oklch(88.6% 0.023 260.7)
-
Step 300
300
#B2C1DD
oklch(80.9% 0.043 263)
-
Step 400
400
#8AA1CB
oklch(70.7% 0.067 262.3)
-
Step 500
500
#6C8ABE
oklch(63.1% 0.086 261.1)
-
Step 600
600
#5473AA
oklch(55.6% 0.093 261.4)
-
Step 700
700
#456092
oklch(49.1% 0.087 262)
-
Step 800
800
#394F76
oklch(42.8% 0.071 261.4)
-
Step 900
900 (this color)
#243451
oklch(32.6% 0.056 261.7)
-
Step 950
950
#1D2638
oklch(26.9% 0.036 263.7)
#243451 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) | #293652 | 0.010 |
| Deuteranopia (no green cones) | #243250 | 0.006 |
| Tritanopia (no blue cones) | #0F3A3E | 0.050 |
| Achromatopsia (no color) | #343434 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243451
#243451
oklch(32.6% 0.056 261.7)
- #43310E
#43310E
oklch(32.6% 0.056 80.9)
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 #243451, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.013
- Dark Blue Grey #1F3B4D ΔE 0.026
- Gunmetal #293241 ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.031
- Midnight Green #073B4C ΔE 0.036
- Onyx #343A40 ΔE 0.047
- Marine #042E60 ΔE 0.048
- Marine Blue #01386A ΔE 0.049
Use #243451 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.