#182F57
Closest named color: Prussian Blue (#1D3557). oklch(31% 0.078 260.7), rgb(24, 47, 87).
Aa
White text reads best on this color (13.26:1).
About this color
#182F57 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.078 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 13.26:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.58:1 |
| White text | 13.26:1 |
Values
| HEX | #182F57 |
| RGB | rgb(24, 47, 87) |
| HSL | hsl(218, 57%, 22%) |
| OKLCH | oklch(31% 0.078 260.7) |
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 #182F57 | 13.26:1 | AAA | Lc -102.7 | Preferred for body text |
| Black text on #182F57 | 1.58:1 | Fails | Lc 0.0 | Not readable |
| #182F57 text on white | 13.26:1 | AAA | Lc 99.4 | Preferred for body text |
| #182F57 text on black | 1.58:1 | 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
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC2FD
oklch(81% 0.092 260.7)
-
Step 400
400
#6A9FFC
oklch(70.7% 0.148 261)
-
Step 500
500
#4184F9
oklch(63.1% 0.188 260.7)
-
Step 600
600
#206AE8
oklch(55.6% 0.204 260.6)
-
Step 700
700
#1257CA
oklch(49.1% 0.191 260.7)
-
Step 800
800
#1348A3
oklch(42.7% 0.157 260.7)
-
Step 900
900
#173E81
oklch(37.8% 0.122 260.5)
-
Step 950
950 (this color)
#182F57
oklch(31% 0.078 260.7)
#182F57 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) | #1C3359 | 0.014 |
| Deuteranopia (no green cones) | #122D56 | 0.010 |
| Tritanopia (no blue cones) | #00383E | 0.064 |
| Achromatopsia (no color) | #303030 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182F57
#182F57
oklch(31% 0.078 260.7)
- #412C00
#412C00
oklch(31% 0.064 80.3)
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 #182F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Marine #042E60 ΔE 0.023
- Marine Blue #01386A ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.044
- Gunmetal #293241 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Midnight Green #073B4C ΔE 0.049
- Oxford Blue #1B263B ΔE 0.054
Use #182F57 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.