#173E68
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.085 252.7), rgb(23, 62, 104).
Aa
White text reads best on this color (10.90:1).
About this color
#173E68 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.085 and its hue 253°. 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 10.90:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #173E68 |
| RGB | rgb(23, 62, 104) |
| HSL | hsl(211, 64%, 25%) |
| OKLCH | oklch(35.9% 0.085 252.7) |
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 #173E68 | 10.90:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #173E68 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #173E68 text on white | 10.90:1 | AAA | Lc 95.0 | Preferred for body text |
| #173E68 text on black | 1.92:1 | Fails | Lc -7.7 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C4EA
oklch(81% 0.064 253)
-
Step 400
400
#71A4DF
oklch(70.6% 0.103 252.8)
-
Step 500
500
#4A8CD6
oklch(63% 0.131 252.9)
-
Step 600
600
#2A75C3
oklch(55.6% 0.141 252.6)
-
Step 700
700
#1C62A9
oklch(49.2% 0.132 252.7)
-
Step 800
800
#1A5089
oklch(42.7% 0.11 252.9)
-
Step 900
900 (this color)
#173E68
oklch(35.9% 0.085 252.7)
-
Step 950
950
#112740
oklch(26.9% 0.055 253.1)
#173E68 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) | #2A416A | 0.023 |
| Deuteranopia (no green cones) | #1E3967 | 0.015 |
| Tritanopia (no blue cones) | #00484E | 0.064 |
| Achromatopsia (no color) | #3D3D3D | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173E68
#173E68
oklch(35.9% 0.085 252.7)
- #553500
#553500
oklch(35.9% 0.077 72.3)
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 #173E68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Twilight Blue #0A437A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Marine #042E60 ΔE 0.055
Use #173E68 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.