#182D5E
Closest named color: Marine (#042E60). oklch(31% 0.092 264.3), rgb(24, 45, 94).
Aa
White text reads best on this color (13.32:1).
About this color
#182D5E is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.092 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.016 away. White text reads best on it, at 13.32:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.57:1 |
| White text | 13.32:1 |
Values
| HEX | #182D5E |
| RGB | rgb(24, 45, 94) |
| HSL | hsl(222, 59%, 23%) |
| OKLCH | oklch(31% 0.092 264.3) |
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 #182D5E | 13.32:1 | AAA | Lc -102.7 | Preferred for body text |
| Black text on #182D5E | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #182D5E text on white | 13.32:1 | AAA | Lc 99.5 | Preferred for body text |
| #182D5E text on black | 1.57:1 | 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 950.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4B80FF
oklch(63.1% 0.197 264.4)
-
Step 600
600
#2660FD
oklch(55.6% 0.241 264.2)
-
Step 700
700
#1B4DDD
oklch(49.1% 0.225 264.4)
-
Step 800
800
#1741B2
oklch(42.7% 0.185 264.2)
-
Step 900
900
#18398D
oklch(37.7% 0.145 264.2)
-
Step 950
950 (this color)
#182D5E
oklch(31% 0.092 264.3)
#182D5E 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) | #123360 | 0.018 |
| Deuteranopia (no green cones) | #012C5D | 0.020 |
| Tritanopia (no blue cones) | #003941 | 0.075 |
| Achromatopsia (no color) | #2F2F2F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182D5E
#182D5E
oklch(31% 0.092 264.3)
- #3F2D00
#3F2D00
oklch(31% 0.064 84.6)
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 #182D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.031
- Marine Blue #01386A ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.056
- Midnight Blue #191970 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.061
- Midnight Green #073B4C ΔE 0.061
- Gunmetal #293241 ΔE 0.062
Use #182D5E 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.