#173367
Closest named color: Marine Blue (#01386A). oklch(33.1% 0.098 261.5), rgb(23, 51, 103).
Aa
White text reads best on this color (12.31:1).
About this color
#173367 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.098 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.018 away. White text reads best on it, at 12.31:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.31:1 |
Values
| HEX | #173367 |
| RGB | rgb(23, 51, 103) |
| HSL | hsl(219, 63%, 25%) |
| OKLCH | oklch(33.1% 0.098 261.5) |
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 #173367 | 12.31:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #173367 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #173367 text on white | 12.31:1 | AAA | Lc 97.7 | Preferred for body text |
| #173367 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A7C2F1
oklch(81% 0.073 261.4)
-
Step 400
400
#77A0EA
oklch(70.7% 0.118 261.7)
-
Step 500
500
#5487E3
oklch(63.1% 0.149 261.3)
-
Step 600
600
#396ED1
oklch(55.5% 0.163 261.5)
-
Step 700
700
#2C5CB5
oklch(49.2% 0.151 261.4)
-
Step 800
800
#254B92
oklch(42.6% 0.125 261.5)
-
Step 900
900 (this color)
#173367
oklch(33.1% 0.098 261.5)
-
Step 950
950
#152644
oklch(27.1% 0.061 261)
#173367 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) | #173969 | 0.018 |
| Deuteranopia (no green cones) | #023166 | 0.018 |
| Tritanopia (no blue cones) | #003F48 | 0.076 |
| Achromatopsia (no color) | #353535 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173367
#173367
oklch(33.1% 0.098 261.5)
- #473100
#473100
oklch(33% 0.068 81.2)
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 #173367, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.018
- Marine #042E60 ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.058
- Midnight Green #073B4C ΔE 0.061
- Midnight Blue #191970 ΔE 0.067
- Space Cadet #2B2D42 ΔE 0.068
Use #173367 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.