Palettes / Colors / #175171

#175171 — Deep Blue

#175171 is a blue color we call Deep Blue, closest to the named color DarkSlateGray (#2F4F4F). It belongs to the blue family.

Color name

Closest CSS keyword: darkslategray (#2F4F4F) — not an exact match. CSS darkslategray gives you #2F4F4F, a different color; use #175171 when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#175171 is a cool blue color associated with trust, calm and professionalism. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #723717; it also sits naturally between #177265 and #172572. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 9% · Green 32% · Blue 44%

Cyan 80% · Magenta 28% · Yellow 0% · Key 56%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #175171

.text { color: #175171; }
.background { background-color: #175171; }
.border { border: 3px solid #175171; }
.text-rgb { color: rgb(23, 81, 113); }
.text-hsl { color: hsl(201, 66%, 27%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #175171; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(23, 81, 113, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #175171; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(23, 81, 113, 0.8); }

HTML: <p style="color:#175171">Text here</p> · <div style="background-color:#175171">Div content here</div>

Shades of #175171

Tints of #175171

Tones of #175171

Color harmonies

Complementary — #723717:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #175171: #FFFFFF.

Semi-transparent (opacity) text on #175171

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #175171 looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #175171 rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #175170  ·  #175172 →

Frequently asked questions

What color is #175171?

#175171 is Deep Blue, a blue color (RGB 23, 81, 113). Its closest standard named color is DarkSlateGray.

What is the RGB and HSL of #175171?

#175171 is RGB 23, 81, 113 — HSL 201°, 66%, 27% — CMYK 80%, 28%, 0%, 56%.

What colors go with #175171?

Its complement is #723717; analogous partners are #177265 and #172572. It also appears in 6+ palettes in our collection.

Can I use #175171 for text?

White text on #175171 has a contrast ratio of 8.56:1 (passes WCAG AA); black text gives 2.45:1.