#173170
Closest named color: Marine Blue (#01386A). oklch(33.4% 0.114 264.2), rgb(23, 49, 112).
Aa
White text reads best on this color (12.28:1).
About this color
#173170 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.114 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.026 away. White text reads best on it, at 12.28:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.28:1 |
Values
| HEX | #173170 |
| RGB | rgb(23, 49, 112) |
| HSL | hsl(222, 66%, 26%) |
| OKLCH | oklch(33.4% 0.114 264.2) |
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 #173170 | 12.28:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #173170 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #173170 text on white | 12.28:1 | AAA | Lc 97.6 | Preferred for body text |
| #173170 text on black | 1.70:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F9
oklch(81% 0.085 263.9)
-
Step 400
400
#759EF6
oklch(70.7% 0.137 264.3)
-
Step 500
500
#5283F2
oklch(63.2% 0.175 264.1)
-
Step 600
600
#3869E0
oklch(55.5% 0.189 264.2)
-
Step 700
700
#2B57C3
oklch(49.2% 0.176 264.2)
-
Step 800
800
#24489E
oklch(42.8% 0.146 264.1)
-
Step 900
900 (this color)
#173170
oklch(33.4% 0.114 264.2)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#173170 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) | #013972 | 0.024 |
| Deuteranopia (no green cones) | #00316F | 0.016 |
| Tritanopia (no blue cones) | #00404B | 0.089 |
| Achromatopsia (no color) | #353535 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173170
#173170
oklch(33.4% 0.114 264.2)
- #473300
#473300
oklch(33.5% 0.069 84.4)
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 #173170, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Marine #042E60 ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.052
- Midnight Blue #191970 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.075
- Midnight Green #073B4C ΔE 0.077
- Royal #0C1793 ΔE 0.079
Use #173170 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.