#173361
Closest named color: Prussian Blue (#1D3557). oklch(32.7% 0.088 259.8), rgb(23, 51, 97).
Aa
White text reads best on this color (12.48:1).
About this color
#173361 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.088 and its hue 260°. 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 12.48:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.48:1 |
Values
| HEX | #173361 |
| RGB | rgb(23, 51, 97) |
| HSL | hsl(217, 62%, 24%) |
| OKLCH | oklch(32.7% 0.088 259.8) |
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 #173361 | 12.48:1 | AAA | Lc -101.5 | Preferred for body text |
| Black text on #173361 | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #173361 text on white | 12.48:1 | AAA | Lc 98.1 | Preferred for body text |
| #173361 text on black | 1.68:1 | 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 900.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EC
oklch(80.9% 0.066 259.9)
-
Step 400
400
#79A1E3
oklch(70.6% 0.107 260.1)
-
Step 500
500
#5689DB
oklch(63.2% 0.136 259.5)
-
Step 600
600
#3B71C8
oklch(55.6% 0.147 259.5)
-
Step 700
700
#2E5EAD
oklch(49.1% 0.137 259.9)
-
Step 800
800
#274D8C
oklch(42.7% 0.113 259.9)
-
Step 900
900 (this color)
#173361
oklch(32.7% 0.088 259.8)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#173361 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) | #1C3763 | 0.014 |
| Deuteranopia (no green cones) | #0E3160 | 0.011 |
| Tritanopia (no blue cones) | #003E45 | 0.070 |
| Achromatopsia (no color) | #343434 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173361
#173361
oklch(32.7% 0.088 259.8)
- #463000
#463000
oklch(32.6% 0.067 80.8)
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 #173361, 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 Blue #01386A ΔE 0.022
- Marine #042E60 ΔE 0.023
- Dark Blue Grey #1F3B4D ΔE 0.050
- Midnight Green #073B4C ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Gunmetal #293241 ΔE 0.060
Use #173361 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.