#182B51
Closest named color: Marine (#042E60). oklch(29.5% 0.074 262.7), rgb(24, 43, 81).
Aa
White text reads best on this color (13.97:1).
About this color
#182B51 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.074 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.030 away. White text reads best on it, at 13.97:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.50:1 |
| White text | 13.97:1 |
Values
| HEX | #182B51 |
| RGB | rgb(24, 43, 81) |
| HSL | hsl(220, 54%, 21%) |
| OKLCH | oklch(29.5% 0.074 262.7) |
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 #182B51 | 13.97:1 | AAA | Lc -103.5 | Preferred for body text |
| Black text on #182B51 | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #182B51 text on white | 13.97:1 | AAA | Lc 100.4 | Preferred for body text |
| #182B51 text on black | 1.50:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#719FF7
oklch(70.8% 0.139 262.4)
-
Step 500
500
#4C83F4
oklch(63% 0.179 262.8)
-
Step 600
600
#316AE2
oklch(55.6% 0.193 262.7)
-
Step 700
700
#2457C5
oklch(49.1% 0.181 262.8)
-
Step 800
800
#1F489F
oklch(42.7% 0.149 262.8)
-
Step 900
900
#1E3D7E
oklch(37.6% 0.116 262.9)
-
Step 950
950 (this color)
#182B51
oklch(29.5% 0.074 262.7)
#182B51 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) | #192F52 | 0.013 |
| Deuteranopia (no green cones) | #102A50 | 0.010 |
| Tritanopia (no blue cones) | #00343A | 0.061 |
| Achromatopsia (no color) | #2C2C2C | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182B51
#182B51
oklch(29.5% 0.074 262.7)
- #3B2900
#3B2900
oklch(29.5% 0.061 82.9)
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 #182B51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.040
- Oxford Blue #1B263B ΔE 0.041
- Gunmetal #293241 ΔE 0.048
- Marine Blue #01386A ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.057
Use #182B51 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.