#3b8bbb

Boston Blue

Closest match (95% match)

Color formats

RGB

rgb(59, 139, 187)

Red, Green, Blue components

HSL

hsl(203, 52%, 48%)

Hue, Saturation, Lightness

CMYK

cmyk(68, 26, 0, 27)

Print color encoding

Luminance

0.230

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3b8bbb

#bb6b3b

Analogous (Adjacent)

#3bbbab

#3b8bbb

#3b4bbb

Triadic

#3b8bbb

#bb3b8b

#8bbb3b

Split complementary

#3b8bbb

#bb3b4b

#bbab3b

Complete conversion table

HEX

#3B8BBB

RGB

rgb(59,139,187)

RGBA

rgba(59,139,187, 1)

HSL

hsl(202.5,52.03%,48.24%)

OKLCH (Modern CSS)

oklch(0.61 0.11 238.4)

CSS Variable

--color: #3b8bbb;

Preview

Readability and Typography

Headline Test

This text demonstrates the reading experience on this background color.

Headline Test

This text demonstrates the reading experience on this background color.

UI Component Set

This is an example alert bar using the selected color.

SOLIDSOFTOUTLINE

Product Mockup

4582 •••• •••• 9018

CARDHOLDER

JOHN DOE

VALID

12/28

Mobile application

Customer support

Hi! How can we help you today?

I love this new color! 😍

Data visualization

Weekly growth

+1,240

12.5%

WED

2,450

Contrast

Contrast and readability (WCAG)

On white background

3.75

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

5.60

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3b8bbb#a0a1bb

ORIG

SIM

Deuteranopia (green)

#3b8bbb#6a61bb

ORIG

SIM

Tritanopia (blue)

#3b8bbb#3f5b65

ORIG

SIM

Monochrome (color blind)

#3b8bbb#848484

Mixing guide

How to mix this color using physical paints or printing inks.

MIXING PALETTE

79%

15%

RYB PIGMENTS

Ultramarine blue

Pigment

79%

Cadmium yellow

Pigment

15%

Ivory black

Pigment

Unlike light, mixing paints makes colors darker. This simulation mimics the behavior of physical pigments.

Physical properties

Perceptual and light-related properties derived from the digital color.

Spectral relationship

Blue hue

450–495 nm • closest visible-spectrum range

750 nm

380 nm

Visual temperature

Cool

A perceptual warm–cool classification. Kelvin does not apply to an arbitrary interface color.

Cool

Neutral

Warm

Luminance (brightness)

23.0%

Dark • relative luminance

50%

100%

An RGB color is produced by combined screen light, so this range is a visual comparison rather than an exact physical wavelength.

Gradient gallery

Generate premium CSS backgrounds and textures from your color.

Similar & Related Colors

Mathematically computed harmonies, shades, and similar tones for this color.

Forget-Me-Not

#0087BD

Warm Spring

#4286BC

Mermaid Dreams

#0088BB

King Triton

#3C85BE

Copper

#BB6B3B

Governor Bay

#3B4BBB

Puerto Rico

#3BBBAB

Medium Red Violet

#BB3B8B

Sushi

#8BBB3B

Night Shadz

#BB3B4B

Malibu

#7DC5F8

Orient

#005581