#378FB8

Closest named color: Blue NCS (#118AB2). oklch(61.5% 0.103 232.2), rgb(55, 143, 184).

Black text reads best on this color (5.78:1).

About this color

#378FB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.103 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.026 away. Black text reads best on it, at 5.78:1.

Hue family	Blues
Lightness	medium-dark (62%)
Chroma	moderately saturated (0.103)
Temperature	cool
Nearest name	Blue NCS (#118AB2)
Black text	5.78:1
White text	3.63:1

Values

HEX	#378FB8
RGB	rgb(55, 143, 184)
HSL	hsl(199, 54%, 47%)
OKLCH	oklch(61.5% 0.103 232.2)

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 #378FB8	3.63:1	AA large text	Lc -69.1	Content text, not long reading
Black text on #378FB8	5.78:1	AA	Lc 40.5	Non-text elements, placeholder text
#378FB8 text on white	3.63:1	AA large text	Lc 63.6	Content text, not long reading
#378FB8 text on black	5.78:1	AA	Lc -38.1	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 500.

Step 50
50

#F1F6F9

oklch(97% 0.007 233.6)
Step 100
100

#E1ECF2

oklch(93.7% 0.014 231.2)
Step 200
200

#C8DDE9

oklch(88.6% 0.028 232.7)
Step 300
300

#A1C7DC

oklch(80.9% 0.05 232.4)
Step 400
400

#6BAACB

oklch(70.8% 0.081 232.4)
Step 500
500 (this color)

#378FB8

oklch(61.5% 0.103 232.2)
Step 600
600

#087EA9

oklch(55.7% 0.111 231.6)
Step 700
700

#006A90

oklch(49.2% 0.1 232)
Step 800
800

#035676

oklch(42.6% 0.087 232.7)
Step 900
900

#12475F

oklch(37.6% 0.067 232.6)
Step 950
950

#0D2A38

oklch(27% 0.043 232.5)

Export this scale for Tailwind in the Tailwind colors tool

#378FB8 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)	#7B8DBA	0.068
Deuteranopia (no green cones)	#6981B7	0.057
Tritanopia (no blue cones)	#009A9D	0.063
Achromatopsia (no color)	#868686	0.103