#173775
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.113 261.9), rgb(23, 55, 117).
Aa
White text reads best on this color (11.41:1).
About this color
#173775 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.113 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.41:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.83:1 |
| White text | 11.41:1 |
Values
| HEX | #173775 |
| RGB | rgb(23, 55, 117) |
| HSL | hsl(220, 67%, 27%) |
| OKLCH | oklch(35.2% 0.113 261.9) |
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 #173775 | 11.41:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #173775 | 1.83:1 | Fails | Lc 8.0 | Not readable |
| #173775 text on white | 11.41:1 | AAA | Lc 95.9 | Preferred for body text |
| #173775 text on black | 1.83:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A3C1F8
oklch(80.8% 0.085 262.3)
-
Step 400
400
#719FF5
oklch(70.7% 0.136 262.1)
-
Step 500
500
#4C84F1
oklch(63% 0.174 262.2)
-
Step 600
600
#2F6BE0
oklch(55.6% 0.189 261.9)
-
Step 700
700
#2258C2
oklch(49% 0.176 262)
-
Step 800
800
#1E499D
oklch(42.7% 0.145 261.9)
-
Step 900
900 (this color)
#173775
oklch(35.2% 0.113 261.9)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#173775 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) | #103E77 | 0.020 |
| Deuteranopia (no green cones) | #003674 | 0.016 |
| Tritanopia (no blue cones) | #004650 | 0.089 |
| Achromatopsia (no color) | #3A3A3A | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173775
#173775
oklch(35.2% 0.113 261.9)
- #4E3600
#4E3600
oklch(35.1% 0.073 81)
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 #173775, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Twilight Blue #0A437A ΔE 0.034
- Marine #042E60 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.052
- Cobalt #1E488F ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.074
- Dark Grey Blue #29465B ΔE 0.075
- Midnight Blue #191970 ΔE 0.075
Use #173775 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.