#18355F
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.082 257.8), rgb(24, 53, 95).
Aa
White text reads best on this color (12.25:1).
About this color
#18355F is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.082 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 12.25:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.25:1 |
Values
| HEX | #18355F |
| RGB | rgb(24, 53, 95) |
| HSL | hsl(215, 60%, 23%) |
| OKLCH | oklch(33.1% 0.082 257.8) |
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 #18355F | 12.25:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #18355F | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #18355F text on white | 12.25:1 | AAA | Lc 97.7 | Preferred for body text |
| #18355F 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
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C2E9
oklch(80.8% 0.062 258.4)
-
Step 400
400
#7AA2DE
oklch(70.7% 0.099 258.3)
-
Step 500
500
#578AD5
oklch(63.1% 0.126 257.9)
-
Step 600
600
#3B72C2
oklch(55.5% 0.138 257.9)
-
Step 700
700
#2E60A8
oklch(49.2% 0.127 257.8)
-
Step 800
800
#274E88
oklch(42.7% 0.106 258.3)
-
Step 900
900 (this color)
#18355F
oklch(33.1% 0.082 257.8)
-
Step 950
950
#162740
oklch(27.2% 0.052 257.9)
#18355F 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) | #213961 | 0.017 |
| Deuteranopia (no green cones) | #16325E | 0.010 |
| Tritanopia (no blue cones) | #003F45 | 0.066 |
| Achromatopsia (no color) | #353535 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18355F
#18355F
oklch(33.1% 0.082 257.8)
- #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 #18355F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Marine Blue #01386A ΔE 0.023
- Marine #042E60 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.042
- Midnight Green #073B4C ΔE 0.045
- Gunmetal #293241 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.057
Use #18355F 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.