#557DC4

Closest named color: Cool Blue (#4984B8). oklch(59.3% 0.118 261.2), rgb(85, 125, 196).

Black text reads best on this color (5.11:1).

About this color

#557DC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.118 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.032 away. Black text reads best on it, at 5.11:1.

Hue family	Blues
Lightness	medium-dark (59%)
Chroma	moderately saturated (0.118)
Temperature	cool
Nearest name	Cool Blue (#4984B8)
Black text	5.11:1
White text	4.10:1

Values

HEX	#557DC4
RGB	rgb(85, 125, 196)
HSL	hsl(218, 48%, 55%)
OKLCH	oklch(59.3% 0.118 261.2)

Contrast

WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.

Pair	WCAG 2	Result	APCA	APCA guidance
White text on #557DC4	4.10:1	AA large text	Lc -73.5	Content text, not long reading
Black text on #557DC4	5.11:1	AA	Lc 36.1	Non-text elements, placeholder text
#557DC4 text on white	4.10:1	AA large text	Lc 68.0	Content text, not long reading
#557DC4 text on black	5.11:1	AA	Lc -33.6	Non-text elements, placeholder text

Tints and shades

A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.

Step 50
50

#F3F6FA

oklch(97.2% 0.006 255.5)
Step 100
100

#E4EAF4

oklch(93.5% 0.015 260.7)
Step 200
200

#CEDAED

oklch(88.5% 0.029 259.6)
Step 300
300

#AEC2E4

oklch(81% 0.053 261)
Step 400
400

#83A1D6

oklch(70.7% 0.085 261.5)
Step 500
500

#6489CB

oklch(63.1% 0.108 261.4)
Step 600
600 (this color)

#557DC4

oklch(59.3% 0.118 261.2)
Step 700
700

#3C5F9F

oklch(49.1% 0.111 261.5)
Step 800
800

#324E80

oklch(42.7% 0.09 261.2)
Step 900
900

#2C4167

oklch(37.7% 0.071 261.6)
Step 950
950

#1A263C

oklch(26.9% 0.045 261.9)

Export this scale for Tailwind in the Tailwind colors tool

#557DC4 with color blindness

Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.

Vision	Seen as	Shift (ΔE)
Protanopia (no red cones)	#6083C7	0.022
Deuteranopia (no green cones)	#5279C2	0.012
Tritanopia (no blue cones)	#008D97	0.106
Achromatopsia (no color)	#7D7D7D	0.118