#182858
Closest named color: Marine (#042E60). oklch(29.3% 0.089 266.9), rgb(24, 40, 88).
Aa
White text reads best on this color (14.15:1).
About this color
#182858 is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.089 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.025 away. White text reads best on it, at 14.15:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.48:1 |
| White text | 14.15:1 |
Values
| HEX | #182858 |
| RGB | rgb(24, 40, 88) |
| HSL | hsl(225, 57%, 22%) |
| OKLCH | oklch(29.3% 0.089 266.9) |
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 #182858 | 14.15:1 | AAA | Lc -103.6 | Preferred for body text |
| Black text on #182858 | 1.48:1 | Fails | Lc 0.0 | Not readable |
| #182858 text on white | 14.15:1 | AAA | Lc 100.6 | Preferred for body text |
| #182858 text on black | 1.48:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#375FFA
oklch(55.7% 0.235 266.9)
-
Step 700
700
#2B4CDA
oklch(49.1% 0.219 267.1)
-
Step 800
800
#2340B0
oklch(42.7% 0.181 266.8)
-
Step 900
900
#20388B
oklch(37.7% 0.141 267)
-
Step 950
950 (this color)
#182858
oklch(29.3% 0.089 266.9)
#182858 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) | #0C2E5A | 0.019 |
| Deuteranopia (no green cones) | #002857 | 0.022 |
| Tritanopia (no blue cones) | #00333B | 0.074 |
| Achromatopsia (no color) | #2B2B2B | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182858
#182858
oklch(29.3% 0.089 266.9)
- #392A00
#392A00
oklch(29.4% 0.06 87.6)
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 #182858, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.053
- Marine Blue #01386A ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.054
- Midnight Blue #191970 ΔE 0.056
- Gunmetal #293241 ΔE 0.064
- Midnight Green #073B4C ΔE 0.069
Use #182858 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.