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#517FA4 Color

#517FA4 is rgb(81, 127, 164) in RGB, hsl(207, 34%, 48%) in HSL, and about cmyk(51%, 23%, 0%, 36%) in CMYK. It has no registered color name of its own — the closest is Air Force Blue (#5D8AA8), clearly related but distinguishable side by side at ΔE 5.9. Black text is the more readable choice on this background.

#517FA4
HEX#517FA4
RGBrgb(81, 127, 164)
HSLhsl(207, 34%, 48%)
HSVhsv(207, 51%, 64%)
CMYKcmyk(51%, 23%, 0%, 36%)
OKLCHoklch(57.9% 0.076 243.9)
LABlab(51.03% -8.16 -25.06)
LCHlch(51.03% 26.35 251.96)

What #517FA4 Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #517FA4, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Air Force Blue#5D8AA8ΔE 5.9Steel Blue#4682B4ΔE 7.84Silver Lake Blue#5D89BAΔE 7.91Queen Blue#436B95ΔE 8.53Glaucous#6082B6ΔE 9.73Cerulean Frost#6D9BC3ΔE 10.84

Browse the full index of named colors A-Z or every blue in the library.

#517FA4 Channel Values

How #517FA4 breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

ModelChannelsNotes
RGBR 81 · G 127 · B 1648-bit channels as sent to the display
HSLH 207° · S 34% · L 48%Easiest model for building lighter and darker variants
HSVH 207° · S 51% · V 64%Matches the picker in most design tools
CMYKC 51% · M 23% · Y 0% · K 36%Approximate ink mix; confirm with an ICC profile before printing
Luminance4.27:1 vs white · 4.92:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #517FA4 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

Fails AAWhite text4.27:1AA normal AA large AAA normal
TextBlack text4.92:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #517FA4 in the contrast checker.

Colors That Go With #517FA4

Pairings derived from color-wheel relationships. The complementary color sits opposite #517FA4; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#517FA4
Complementary
#A47651
Analogous
#51A4A0
Analogous
#5155A4
Triadic
#A4517F
Triadic
#7FA451
Split comp.
#A45155
Split comp.
#A4A051

Tints & Shades of #517FA4

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

#6590B3
#7DA1BF
#95B3CB
#B0C6D8
#C8D8E4
#E0E9F0

Shades

#476F90
#3B5C78
#314C63
#273D4F
#1D2D3A
#111A22

Want a full 50-950 ramp with semantic roles? Generate design tokens from #517FA4.

How #517FA4 Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#517FA4
Protanopia#7979A4
Protanomaly#6B7BA4
Deuteranopia#7272A5
Deuteranomaly#6778A4
Tritanopia#468484
Tritanomaly#4B8292
Achromatopsia#7A7A7A

Test a full palette in the color blindness simulator.

Using #517FA4 in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-517fa4: #517FA4;
CSS backgroundbackground-color: #517FA4;
Tailwind configcolors: { 'color-517fa4': '#517FA4' }
SwiftUIColor(red: 0.318, green: 0.498, blue: 0.643)
Android XML<color name="color_517fa4">#517FA4</color>
SVG fillfill="#517FA4"

More Blue Colors

#517FA4 sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#517FA4 Frequently Asked Questions

What color is #517FA4?

#517FA4 is a mid-tone blue — rgb(81, 127, 164) in RGB and hsl(207, 34%, 48%) in HSL. It carries no registered color name of its own; the closest named color is Air Force Blue (#5D8AA8), which is clearly related but distinguishable side by side at a CIE76 distance of 5.9.

What is the RGB value of #517FA4?

#517FA4 is rgb(81, 127, 164) — red 81, green 127, and blue 164 on the 0-255 scale.

What is the CMYK value of #517FA4?

#517FA4 converts to approximately cmyk(51%, 23%, 0%, 36%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #517FA4 be black or white?

Black text is the more readable choice. #517FA4 scores 4.27:1 against white and 4.92:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #517FA4 as a CSS color keyword?

No. #517FA4 is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is steelblue (#4682B4) at a CIE76 distance of 7.84, which is clearly related but distinguishable side by side.

Open #517FA4 in a Tool

Hex to RGBHex to HSLHex to CMYKHex to OKLCHHex to PantoneBuild a paletteMake a gradient

Keep exploring: every blue in the color library, the guide to shades of blue, or the full color library.