#182D4F
Closest named color: Prussian Blue (#1D3557). oklch(29.9% 0.068 259.6), rgb(24, 45, 79).
Aa
White text reads best on this color (13.75:1).
About this color
#182D4F is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.068 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.029 away. White text reads best on it, at 13.75:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.52:1 |
| White text | 13.75:1 |
Values
| HEX | #182D4F |
| RGB | rgb(24, 45, 79) |
| HSL | hsl(217, 53%, 20%) |
| OKLCH | oklch(29.9% 0.068 259.6) |
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 #182D4F | 13.75:1 | AAA | Lc -103.3 | Preferred for body text |
| Black text on #182D4F | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #182D4F text on white | 13.75:1 | AAA | Lc 100.2 | Preferred for body text |
| #182D4F text on black | 1.52:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF7
oklch(88.4% 0.045 259.9)
-
Step 300
300
#A2C2F5
oklch(80.9% 0.081 259.6)
-
Step 400
400
#70A1F0
oklch(70.8% 0.128 259.6)
-
Step 500
500
#4987EB
oklch(63.2% 0.164 259.5)
-
Step 600
600
#2B6ED9
oklch(55.6% 0.178 259.6)
-
Step 700
700
#1D5BBC
oklch(49% 0.165 259.5)
-
Step 800
800
#1B4B98
oklch(42.7% 0.137 259.7)
-
Step 900
900
#1C3F79
oklch(37.6% 0.107 260)
-
Step 950
950 (this color)
#182D4F
oklch(29.9% 0.068 259.6)
#182D4F 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) | #1E3050 | 0.013 |
| Deuteranopia (no green cones) | #162B4E | 0.007 |
| Tritanopia (no blue cones) | #00353A | 0.056 |
| Achromatopsia (no color) | #2D2D2D | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182D4F
#182D4F
oklch(29.9% 0.068 259.6)
- #3E2900
#3E2900
oklch(29.9% 0.062 78.8)
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 #182D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.035
- Oxford Blue #1B263B ΔE 0.039
- Gunmetal #293241 ΔE 0.041
- Midnight Green #073B4C ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Marine Blue #01386A ΔE 0.054
Use #182D4F 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.