#183556
Closest named color: Prussian Blue (#1D3557). oklch(32.4% 0.069 253.2), rgb(24, 53, 86).
Aa
White text reads best on this color (12.48:1).
About this color
#183556 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.069 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.006 away. White text reads best on it, at 12.48:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.48:1 |
Values
| HEX | #183556 |
| RGB | rgb(24, 53, 86) |
| HSL | hsl(212, 56%, 22%) |
| OKLCH | oklch(32.4% 0.069 253.2) |
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 #183556 | 12.48:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #183556 | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #183556 text on white | 12.48:1 | AAA | Lc 98.2 | Preferred for body text |
| #183556 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#AAC3E2
oklch(80.9% 0.052 253.9)
-
Step 400
400
#7CA4D3
oklch(70.7% 0.082 252.9)
-
Step 500
500
#5A8CC8
oklch(63% 0.106 253.8)
-
Step 600
600
#3F75B4
oklch(55.5% 0.114 253.6)
-
Step 700
700
#30629B
oklch(49% 0.107 253.4)
-
Step 800
800
#29517E
oklch(42.8% 0.088 252.9)
-
Step 900
900 (this color)
#183556
oklch(32.4% 0.069 253.2)
-
Step 950
950
#17273B
oklch(26.9% 0.043 254.6)
#183556 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) | #263757 | 0.019 |
| Deuteranopia (no green cones) | #1E3155 | 0.013 |
| Tritanopia (no blue cones) | #003D41 | 0.055 |
| Achromatopsia (no color) | #343434 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183556
#183556
oklch(32.4% 0.069 253.2)
- #492D00
#492D00
oklch(32.4% 0.069 72.5)
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 #183556, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.006
- Dark Blue Grey #1F3B4D ΔE 0.030
- Midnight Green #073B4C ΔE 0.032
- Marine #042E60 ΔE 0.036
- Marine Blue #01386A ΔE 0.036
- Gunmetal #293241 ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.043
- Onyx #343A40 ΔE 0.059
Use #183556 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.