#1551d1

Color #1551d1

A vivid, highly saturated medium blue.

Closest named color Royal Blue #4169e1 · ΔE 11.71 Nearest Tailwind class blue-700 #1447e6 · ΔE 4.2

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#1551d1

RGB

rgb(21, 81, 209)

HSL

hsl(220.9, 81.7%, 45.1%)

HSV / HSB

hsv(220.9, 90%, 82%)

CMYK

cmyk(90%, 61.2%, 0%, 18%)

LAB

lab(38.98, 31.76, -70.61)

LCH

lch(38.98, 77.42, 294.22)

OKLCH

oklch(48.6%, 0.2063, 262.62)

HWB

hwb(220.9, 8.2%, 18%)

Harmony colors

Complementary

#d19515

Analogous

#15afd1

#1551d1

#3715d1

Triadic

#1551d1

#d11551

#51d115

Split-complementary

#1551d1

#d13715

#afd115

Tetradic

#1551d1

#9515d1

#d19515

#51d115

Square

#1551d1

#d115af

#d19515

#15d137

Shades

Color #1551d1 mixed toward black.

#1243ae

#0e368b

#0b2868

#071b46

#040d23

Tints

Color #1551d1 mixed toward white.

#2b68ea

#5586ee

#80a4f2

#aac2f6

#d5e1fb

Tones

Color #1551d1 mixed toward gray.

#2557c1

#345cb2

#4462a2

#546892

#636d83

Accessibility

Aa White text on this color

6.71:1

Aa Black text on this color

3.13:1

White text reads better on this background (6.71:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#3839bc · ΔE 8.3

Deuteranopia

#3530b7 · ΔE 10.5

Tritanopia

#1ba9a5 · ΔE 42.6

Achromatopsia

#5c5c5c · ΔE 28.3

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #1551d1;

Tailwind (arbitrary value)

bg-[#1551d1]

Related colors

Cornflower Blue #6495ed

Royal Blue #4169e1

Light Steel Blue #b0c4de

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Frequently asked questions

#1551d1 (#1551d1) is rgb(21, 81, 209) in RGB.

No, #1551d1 is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

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Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

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Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

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Build something with this color

Generate a full palette from #1551d1, or check how it holds up for accessibility.

Generate a palette → Check contrast