#173865
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.088 257), rgb(23, 56, 101).
Aa
White text reads best on this color (11.73:1).
About this color
#173865 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.088 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.73:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.73:1 |
Values
| HEX | #173865 |
| RGB | rgb(23, 56, 101) |
| HSL | hsl(215, 63%, 24%) |
| OKLCH | oklch(34.2% 0.088 257) |
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 #173865 | 11.73:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #173865 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #173865 text on white | 11.73:1 | AAA | Lc 96.7 | Preferred for body text |
| #173865 text on black | 1.79:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#75A3E2
oklch(70.8% 0.105 256.4)
-
Step 500
500
#518ADA
oklch(63.1% 0.135 257.1)
-
Step 600
600
#3472C7
oklch(55.5% 0.147 257.1)
-
Step 700
700
#265FAC
oklch(49% 0.137 257.1)
-
Step 800
800
#214E8B
oklch(42.6% 0.113 256.9)
-
Step 900
900 (this color)
#173865
oklch(34.2% 0.088 257)
-
Step 950
950
#142741
oklch(27.1% 0.055 256.6)
#173865 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) | #223C67 | 0.018 |
| Deuteranopia (no green cones) | #153564 | 0.010 |
| Tritanopia (no blue cones) | #004349 | 0.070 |
| Achromatopsia (no color) | #383838 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173865
#173865
oklch(34.2% 0.088 257)
- #4D3300
#4D3300
oklch(34.3% 0.072 77.5)
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 #173865, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.025
- Marine #042E60 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.057
- Gunmetal #293241 ΔE 0.064
Use #173865 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.