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#3987B1 Color

#3987B1 is rgb(57, 135, 177) in RGB, hsl(201, 51%, 46%) in HSL, and about cmyk(68%, 24%, 0%, 31%) in CMYK. It has no registered color name of its own — the closest is Cerulean (#007BA7), clearly related but distinguishable side by side at ΔE 6.35. Black text is the more readable choice on this background.

#3987B1
HEX#3987B1
RGBrgb(57, 135, 177)
HSLhsl(201, 51%, 46%)
HSVhsv(201, 68%, 69%)
CMYKcmyk(68%, 24%, 0%, 31%)
OKLCHoklch(59.3% 0.099 235.5)
LABlab(52.89% -14.36 -29.77)
LCHlch(52.89% 33.05 244.25)

What #3987B1 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 #3987B1, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Cerulean#007BA7ΔE 6.35Steel Blue#4682B4ΔE 6.79Blue (NCS)#0087BDΔE 8.05Silver Lake Blue#5D89BAΔE 9.76Air Force Blue#5D8AA8ΔE 10.11Carolina Blue#4B9CD3ΔE 10.54

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

#3987B1 Channel Values

How #3987B1 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 57 · G 135 · B 1778-bit channels as sent to the display
HSLH 201° · S 51% · L 46%Easiest model for building lighter and darker variants
HSVH 201° · S 68% · V 69%Matches the picker in most design tools
CMYKC 68% · M 24% · Y 0% · K 31%Approximate ink mix; confirm with an ICC profile before printing
Luminance3.98:1 vs white · 5.27:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #3987B1 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 text3.98:1AA normal AA large AAA normal
TextBlack text5.27:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #3987B1 in the contrast checker.

Colors That Go With #3987B1

Pairings derived from color-wheel relationships. The complementary color sits opposite #3987B1; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#3987B1
Complementary
#B16339
Analogous
#39B19F
Analogous
#394BB1
Triadic
#B13987
Triadic
#87B139
Split comp.
#B1394B
Split comp.
#B19F39

Tints & Shades of #3987B1

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

#4A99C4
#69ABCE
#84BAD7
#A3CBE1
#BEDAEA
#DCECF4

Shades

#32769A
#2A6483
#23526C
#1B4155
#142F3E
#0C1D27

Want a full 50-950 ramp with semantic roles? Generate design tokens from #3987B1.

How #3987B1 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#3987B1
Protanopia#7E7EB1
Protanomaly#6982B1
Deuteranopia#7474B2
Deuteranomaly#627CB2
Tritanopia#228D8D
Tritanomaly#2D8B9D
Achromatopsia#7F7F7F

Test a full palette in the color blindness simulator.

Using #3987B1 in Code

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

CSS custom property--color-3987b1: #3987B1;
CSS backgroundbackground-color: #3987B1;
Tailwind configcolors: { 'color-3987b1': '#3987B1' }
SwiftUIColor(red: 0.224, green: 0.529, blue: 0.694)
Android XML<color name="color_3987b1">#3987B1</color>
SVG fillfill="#3987B1"

More Blue Colors

#3987B1 sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#3987B1 Frequently Asked Questions

What color is #3987B1?

#3987B1 is a mid-tone blue — rgb(57, 135, 177) in RGB and hsl(201, 51%, 46%) in HSL. It carries no registered color name of its own; the closest named color is Cerulean (#007BA7), which is clearly related but distinguishable side by side at a CIE76 distance of 6.35.

What is the RGB value of #3987B1?

#3987B1 is rgb(57, 135, 177) — red 57, green 135, and blue 177 on the 0-255 scale.

What is the CMYK value of #3987B1?

#3987B1 converts to approximately cmyk(68%, 24%, 0%, 31%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #3987B1 be black or white?

Black text is the more readable choice. #3987B1 scores 3.98:1 against white and 5.27:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #3987B1 as a CSS color keyword?

No. #3987B1 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 6.79, which is clearly related but distinguishable side by side.

Open #3987B1 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.