Palettes / Colors / #3F445A

#3F445A — Dusty Blue

#3F445A is a blue color we call Dusty 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 #3F445A 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.

#3F445A is a cool blue color associated with trust, calm and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #5A553F; it also sits naturally between #3F525A and #473F5A. 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 25% · Green 27% · Blue 35%

Cyan 30% · Magenta 24% · Yellow 0% · Key 65%

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

Previews

CSS code for #3F445A

.text { color: #3F445A; }
.background { background-color: #3F445A; }
.border { border: 3px solid #3F445A; }
.text-rgb { color: rgb(63, 68, 90); }
.text-hsl { color: hsl(229, 18%, 30%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #3F445A; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(63, 68, 90, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #3F445A; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(63, 68, 90, 0.8); }

HTML: <p style="color:#3F445A">Text here</p> · <div style="background-color:#3F445A">Div content here</div>

Shades of #3F445A

Tints of #3F445A

Tones of #3F445A

Color harmonies

Complementary — #5A553F:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #3F445A: #FFFFFF.

Semi-transparent (opacity) text on #3F445A

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 #3F445A 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 #3F445A 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

← #3F4459  ·  #3F445B →

Frequently asked questions

What color is #3F445A?

#3F445A is Dusty Blue, a blue color (RGB 63, 68, 90). Its closest standard named color is DarkSlateGray.

What is the RGB and HSL of #3F445A?

#3F445A is RGB 63, 68, 90 — HSL 229°, 18%, 30% — CMYK 30%, 24%, 0%, 65%.

What colors go with #3F445A?

Its complement is #5A553F; analogous partners are #3F525A and #473F5A. It also appears in 6+ palettes in our collection.

Can I use #3F445A for text?

White text on #3F445A has a contrast ratio of 9.61:1 (passes WCAG AA); black text gives 2.19:1.