warm blue

#4B57DB

Every value on this page is computed at build time from the hex code above using ChromaWell's shared, unit-tested color-core library — the same conversion, contrast, and nearest-name math used across every color page on this site, so a value here matches the same color looked up anywhere else on ChromaWell.

The conversions block gives you the same color in seven common formats (hex, RGB, HSL, HSV, CMYK, Lab, and OKLCH) so you can copy whichever your codebase or design tool expects. The contrast block applies the WCAG 2.x relative-luminance formula against several common backgrounds and reports whether text in this color would pass AA or AAA at normal and large text sizes. Shades/tints step the lightness up and down at a fixed hue and saturation; harmonies rotate the hue around the color wheel to surface complementary, analogous, triadic, and split-complementary partners; and nearest named colors ranks the closest matches from our full 1,094-color dataset by CIE76 Delta-E distance in Lab space, a perceptual distance metric rather than a raw RGB difference.

Conversions

HEX: #4B57DB
RGB: rgb(75, 87, 219)
HSL: hsl(235, 66.7%, 57.6%)
HSV: hsv(235, 65.8%, 85.9%)
CMYK: cmyk(65.8, 60.3, 0, 14.1)
Lab: lab(43.4, 36.8, -69.04)
OKLCH: oklch(0.5267 0.1993 273.4)

WCAG contrast

On white: 5.7:1 — normal text AA, large text AAA
On black: 3.69:1 — normal text FAIL, large text AA
On pure white: 5.7:1 — normal text AA, large text AAA
On pure black: 3.69:1 — normal text FAIL, large text AA
On light gray (#F3F4F6): 5.18:1 — normal text AA, large text AAA
On dark slate (#1F2937): 2.58:1 — normal text FAIL, large text FAIL

Ratios computed from WCAG 2.x relative luminance; AA needs 4.5:1 for normal text and 3:1 for large text (18pt+ or 14pt+ bold), AAA needs 7:1 and 4.5:1 respectively.

Shades & tints

#171F75

#2430B5

#4B57DB

#8B92E8

#CACEF4

Lightness stepped ±15% and ±30% in HSL space at constant hue and saturation (235°, 66.7%) — a shade darkens toward black, a tint lightens toward white.

Color harmonies

Hue-wheel relationships computed at this color's exact hue (235°), holding saturation and lightness constant.

Complementary

#DBCF4B

rgb(219, 207, 75)

Analogous −30°

#4B9FDB

rgb(75, 159, 219)

Analogous +30°

#874BDB

rgb(135, 75, 219)

Triadic 120°

#DB4B57

rgb(219, 75, 87)

Triadic 240°

#57DB4B

rgb(87, 219, 75)

Split-complementary −150°

#9FDB4B

rgb(159, 219, 75)

Split-complementary +150°

#DB874B

rgb(219, 135, 75)

Nearest named colors

MediumSlateBlue (ΔE 10.4)
SlateBlue (ΔE 11.5)
RoyalBlue (ΔE 12.0)
MediumPurple (ΔE 22.2)
RebeccaPurple (ΔE 25.0)

Ranked by CIE76 Delta-E distance in Lab space — the lower the number, the closer the perceptual match to this exact color.

Perceptual profile

Hue 235° places this color in the cool range of the wheel. At 66.7% saturation it reads as moderately saturated, and at 57.6% lightness it sits at mid-tone. In OKLCH — the newer, perceptually uniform color space — this color's lightness is 0.5267, chroma 0.1993, hue 273.4°, which is a more accurate predictor of how "bright" this color will look next to others than HSL lightness alone.

Use in CSS

This is a cool hue at 66.7% saturation and 57.6% lightness. Drop it into a stylesheet as a custom property:

:root {
  --color-4b57db: #4B57DB;
}
.el {
  color: var(--color-4b57db);
}

Part of the open xkcd color survey named-color set — see methodology.