#173A62
Closest named color: Marine Blue (#01386A). oklch(34.5% 0.081 253.7), rgb(23, 58, 98).
Aa
White text reads best on this color (11.55:1).
About this color
#173A62 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.081 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.021 away. White text reads best on it, at 11.55:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.55:1 |
Values
| HEX | #173A62 |
| RGB | rgb(23, 58, 98) |
| HSL | hsl(212, 62%, 24%) |
| OKLCH | oklch(34.5% 0.081 253.7) |
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 #173A62 | 11.55:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #173A62 | 1.81:1 | Fails | Lc 7.6 | Not readable |
| #173A62 text on white | 11.55:1 | AAA | Lc 96.3 | Preferred for body text |
| #173A62 text on black | 1.81:1 | 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A6C3E8
oklch(80.8% 0.061 254.7)
-
Step 400
400
#75A4DC
oklch(70.7% 0.097 253.4)
-
Step 500
500
#508CD3
oklch(63.1% 0.125 253.8)
-
Step 600
600
#3275C0
oklch(55.7% 0.135 253.5)
-
Step 700
700
#2462A6
oklch(49.2% 0.126 253.5)
-
Step 800
800
#205086
oklch(42.7% 0.104 253.6)
-
Step 900
900 (this color)
#173A62
oklch(34.5% 0.081 253.7)
-
Step 950
950
#13273F
oklch(26.9% 0.052 254)
#173A62 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) | #283D64 | 0.022 |
| Deuteranopia (no green cones) | #1C3661 | 0.012 |
| Tritanopia (no blue cones) | #004349 | 0.062 |
| Achromatopsia (no color) | #393939 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173A62
#173A62
oklch(34.5% 0.081 253.7)
- #503200
#503200
oklch(34.5% 0.074 72.8)
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 #173A62, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.021
- Prussian Blue #1D3557 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.039
- Marine #042E60 ΔE 0.042
- Midnight Green #073B4C ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.049
- Charcoal #264653 ΔE 0.056
Use #173A62 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.