#173174
Closest named color: Marine Blue (#01386A). oklch(33.7% 0.12 264.7), rgb(23, 49, 116).
Aa
White text reads best on this color (12.15:1).
About this color
#173174 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.120 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 12.15:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.72:1 |
| White text | 12.15:1 |
Values
| HEX | #173174 |
| RGB | rgb(23, 49, 116) |
| HSL | hsl(223, 67%, 27%) |
| OKLCH | oklch(33.7% 0.12 264.7) |
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 #173174 | 12.15:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #173174 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #173174 text on white | 12.15:1 | AAA | Lc 97.3 | Preferred for body text |
| #173174 text on black | 1.72:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A4C0FC
oklch(80.9% 0.091 265)
-
Step 400
400
#739DFA
oklch(70.6% 0.144 264.6)
-
Step 500
500
#5081F7
oklch(63% 0.184 264.7)
-
Step 600
600
#3667E6
oklch(55.5% 0.2 264.7)
-
Step 700
700
#2A55C8
oklch(49.1% 0.186 264.7)
-
Step 800
800
#2346A2
oklch(42.7% 0.155 264.8)
-
Step 900
900 (this color)
#173174
oklch(33.7% 0.12 264.7)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#173174 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) | #003A76 | 0.026 |
| Deuteranopia (no green cones) | #003273 | 0.015 |
| Tritanopia (no blue cones) | #00424D | 0.095 |
| Achromatopsia (no color) | #363636 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173174
#173174
oklch(33.7% 0.12 264.7)
- #483400
#483400
oklch(33.9% 0.069 84.8)
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 #173174, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Marine #042E60 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.054
- Midnight Blue #191970 ΔE 0.058
- Royal #0C1793 ΔE 0.074
- Cobalt #1E488F ΔE 0.078
- Dark Blue Grey #1F3B4D ΔE 0.081
Use #173174 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.