#173D62
Closest named color: Marine Blue (#01386A). oklch(35.3% 0.078 250.5), rgb(23, 61, 98).
Aa
White text reads best on this color (11.16:1).
About this color
#173D62 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.078 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.027 away. White text reads best on it, at 11.16:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.16:1 |
Values
| HEX | #173D62 |
| RGB | rgb(23, 61, 98) |
| HSL | hsl(210, 62%, 24%) |
| OKLCH | oklch(35.3% 0.078 250.5) |
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 #173D62 | 11.16:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #173D62 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #173D62 text on white | 11.16:1 | AAA | Lc 95.6 | Preferred for body text |
| #173D62 text on black | 1.88:1 | 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
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E6
oklch(80.9% 0.059 250.9)
-
Step 400
400
#73A5D9
oklch(70.7% 0.093 250.2)
-
Step 500
500
#4D8DCF
oklch(63% 0.12 250.9)
-
Step 600
600
#2E76BC
oklch(55.6% 0.13 250.9)
-
Step 700
700
#2063A2
oklch(49.1% 0.121 250.7)
-
Step 800
800
#1D5183
oklch(42.7% 0.1 250.7)
-
Step 900
900 (this color)
#173D62
oklch(35.3% 0.078 250.5)
-
Step 950
950
#12283E
oklch(27.1% 0.05 250.2)
#173D62 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) | #2C3F64 | 0.025 |
| Deuteranopia (no green cones) | #213861 | 0.017 |
| Tritanopia (no blue cones) | #00464B | 0.058 |
| Achromatopsia (no color) | #3B3B3B | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173D62
#173D62
oklch(35.3% 0.078 250.5)
- #543300
#543300
oklch(35.3% 0.076 70.4)
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 #173D62, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.041
- Midnight Green #073B4C ΔE 0.042
- Twilight Blue #0A437A ΔE 0.042
- Charcoal #264653 ΔE 0.048
- Marine #042E60 ΔE 0.051
Use #173D62 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.