#173568
Closest named color: Marine Blue (#01386A). oklch(33.7% 0.096 260.3), rgb(23, 53, 104).
Aa
White text reads best on this color (12.03:1).
About this color
#173568 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.096 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.015 away. White text reads best on it, at 12.03:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.74:1 |
| White text | 12.03:1 |
Values
| HEX | #173568 |
| RGB | rgb(23, 53, 104) |
| HSL | hsl(218, 64%, 25%) |
| OKLCH | oklch(33.7% 0.096 260.3) |
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 #173568 | 12.03:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #173568 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #173568 text on white | 12.03:1 | AAA | Lc 97.2 | Preferred for body text |
| #173568 text on black | 1.74:1 | 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A6C2F0
oklch(80.9% 0.072 260.3)
-
Step 400
400
#76A1E9
oklch(70.8% 0.116 260.3)
-
Step 500
500
#5288E2
oklch(63.2% 0.148 260.1)
-
Step 600
600
#376FD0
oklch(55.6% 0.161 260.6)
-
Step 700
700
#295DB4
oklch(49.2% 0.149 260.1)
-
Step 800
800
#234C92
oklch(42.7% 0.124 260.4)
-
Step 900
900 (this color)
#173568
oklch(33.7% 0.096 260.3)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#173568 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) | #1A3A6A | 0.016 |
| Deuteranopia (no green cones) | #073367 | 0.014 |
| Tritanopia (no blue cones) | #004149 | 0.076 |
| Achromatopsia (no color) | #363636 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173568
#173568
oklch(33.7% 0.096 260.3)
- #4A3200
#4A3200
oklch(33.7% 0.07 79.3)
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 #173568, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.015
- Prussian Blue #1D3557 ΔE 0.030
- Marine #042E60 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.056
- Midnight Green #073B4C ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.070
Use #173568 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.