#173358
Closest named color: Prussian Blue (#1D3557). oklch(32% 0.075 256.2), rgb(23, 51, 88).
Aa
White text reads best on this color (12.72:1).
About this color
#173358 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.075 and its hue 256°. 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 12.72:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.65:1 |
| White text | 12.72:1 |
Values
| HEX | #173358 |
| RGB | rgb(23, 51, 88) |
| HSL | hsl(214, 59%, 22%) |
| OKLCH | oklch(32% 0.075 256.2) |
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 #173358 | 12.72:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #173358 | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #173358 text on white | 12.72:1 | AAA | Lc 98.6 | Preferred for body text |
| #173358 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
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9BC3F9
oklch(80.8% 0.088 256.1)
-
Step 400
400
#63A2F7
oklch(70.7% 0.141 256.3)
-
Step 500
500
#3288F3
oklch(63.1% 0.18 256)
-
Step 600
600
#006FE0
oklch(55.6% 0.192 256.3)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#0C407E
oklch(37.7% 0.117 256.1)
-
Step 950
950 (this color)
#173358
oklch(32% 0.075 256.2)
#173358 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) | #223659 | 0.017 |
| Deuteranopia (no green cones) | #183057 | 0.009 |
| Tritanopia (no blue cones) | #003C41 | 0.060 |
| Achromatopsia (no color) | #333333 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173358
#173358
oklch(32% 0.075 256.2)
- #462D00
#462D00
oklch(31.9% 0.067 75.8)
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 #173358, 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 0.034
- Dark Blue Grey #1F3B4D ΔE 0.038
- Midnight Green #073B4C ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.045
- Gunmetal #293241 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.061
Use #173358 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.