#183560
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.084 258.2), rgb(24, 53, 96).
Aa
White text reads best on this color (12.23:1).
About this color
#183560 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.084 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 12.23:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.23:1 |
Values
| HEX | #183560 |
| RGB | rgb(24, 53, 96) |
| HSL | hsl(216, 60%, 24%) |
| OKLCH | oklch(33.1% 0.084 258.2) |
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 #183560 | 12.23:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #183560 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #183560 text on white | 12.23:1 | AAA | Lc 97.7 | Preferred for body text |
| #183560 text on black | 1.71:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EA
oklch(80.8% 0.064 258.9)
-
Step 400
400
#79A2DF
oklch(70.7% 0.101 258.1)
-
Step 500
500
#568AD6
oklch(63.1% 0.128 257.8)
-
Step 600
600
#3B72C4
oklch(55.6% 0.14 258.3)
-
Step 700
700
#2D5FA9
oklch(49% 0.13 258.3)
-
Step 800
800
#264E89
oklch(42.7% 0.108 258.2)
-
Step 900
900 (this color)
#183560
oklch(33.1% 0.084 258.2)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#183560 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) | #213962 | 0.017 |
| Deuteranopia (no green cones) | #15325F | 0.010 |
| Tritanopia (no blue cones) | #003F45 | 0.067 |
| Achromatopsia (no color) | #353535 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183560
#183560
oklch(33.1% 0.084 258.2)
- #493000
#493000
oklch(33.1% 0.069 77.3)
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 #183560, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Marine Blue #01386A ΔE 0.022
- Marine #042E60 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.044
- Midnight Green #073B4C ΔE 0.047
- Twilight Blue #0A437A ΔE 0.056
- Gunmetal #293241 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.057
Use #183560 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.