#183359
Closest named color: Prussian Blue (#1D3557). oklch(32.1% 0.076 257.3), rgb(24, 51, 89).
Aa
White text reads best on this color (12.67:1).
About this color
#183359 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.076 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.010 away. White text reads best on it, at 12.67:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.65:1 |
| White text | 12.67:1 |
Values
| HEX | #183359 |
| RGB | rgb(24, 51, 89) |
| HSL | hsl(215, 58%, 22%) |
| OKLCH | oklch(32.1% 0.076 257.3) |
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 #183359 | 12.67:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #183359 | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #183359 text on white | 12.67:1 | AAA | Lc 98.5 | Preferred for body text |
| #183359 text on black | 1.65:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9CC3FB
oklch(80.9% 0.09 257.4)
-
Step 400
400
#64A1F8
oklch(70.6% 0.143 257.4)
-
Step 500
500
#3587F5
oklch(63.1% 0.183 257.1)
-
Step 600
600
#016DE4
oklch(55.5% 0.199 257.3)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004BA0
oklch(42.8% 0.152 257.1)
-
Step 900
900
#0F3F7F
oklch(37.6% 0.119 257.5)
-
Step 950
950 (this color)
#183359
oklch(32.1% 0.076 257.3)
#183359 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) | #22365B | 0.016 |
| Deuteranopia (no green cones) | #183058 | 0.009 |
| Tritanopia (no blue cones) | #003C41 | 0.062 |
| Achromatopsia (no color) | #333333 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183359
#183359
oklch(32.1% 0.076 257.3)
- #462E00
#462E00
oklch(32.2% 0.067 77.5)
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 #183359, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.010
- Marine #042E60 ΔE 0.028
- Marine Blue #01386A ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.039
- Midnight Green #073B4C ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.046
- Gunmetal #293241 ΔE 0.046
- Oxford Blue #1B263B ΔE 0.062
Use #183359 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.