#182B5E
Closest named color: Marine (#042E60). oklch(30.5% 0.094 265.7), rgb(24, 43, 94).
Aa
White text reads best on this color (13.58:1).
About this color
#182B5E is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.094 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.017 away. White text reads best on it, at 13.58:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.54:1 |
| White text | 13.58:1 |
Values
| HEX | #182B5E |
| RGB | rgb(24, 43, 94) |
| HSL | hsl(224, 59%, 23%) |
| OKLCH | oklch(30.5% 0.094 265.7) |
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 #182B5E | 13.58:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #182B5E | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #182B5E text on white | 13.58:1 | AAA | Lc 99.8 | Preferred for body text |
| #182B5E text on black | 1.54:1 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#2E5EFF
oklch(55.7% 0.244 265.6)
-
Step 700
700
#224AE1
oklch(49.1% 0.232 265.8)
-
Step 800
800
#1C3EB5
oklch(42.6% 0.191 265.7)
-
Step 900
900
#1B378F
oklch(37.6% 0.149 265.8)
-
Step 950
950 (this color)
#182B5E
oklch(30.5% 0.094 265.7)
#182B5E 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) | #0D3160 | 0.019 |
| Deuteranopia (no green cones) | #002B5D | 0.020 |
| Tritanopia (no blue cones) | #003740 | 0.076 |
| Achromatopsia (no color) | #2E2E2E | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182B5E
#182B5E
oklch(30.5% 0.094 265.7)
- #3D2C00
#3D2C00
oklch(30.5% 0.062 85.6)
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 #182B5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.042
- Midnight Blue #191970 ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.063
- Gunmetal #293241 ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.066
Use #182B5E 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.