#397DB9

Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.116 248), rgb(57, 125, 185).

Black text reads best on this color (4.80:1).

About this color

#397DB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.116 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. Black text reads best on it, at 4.80:1.

Hue family	Blues
Lightness	medium-dark (57%)
Chroma	moderately saturated (0.116)
Temperature	cool
Nearest name	Windows Blue (#3778BF)
Black text	4.80:1
White text	4.36:1

Values

HEX	#397DB9
RGB	rgb(57, 125, 185)
HSL	hsl(208, 53%, 47%)
OKLCH	oklch(57.4% 0.116 248)

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 #397DB9	4.36:1	AA large text	Lc -75.5	Fine for body text
Black text on #397DB9	4.80:1	AA	Lc 34.1	Non-text elements, placeholder text
#397DB9 text on white	4.36:1	AA large text	Lc 70.0	Content text, not long reading
#397DB9 text on black	4.80:1	AA	Lc -31.7	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

#F2F6FA

oklch(97.1% 0.007 247.9)
Step 100
100

#E2EBF4

oklch(93.6% 0.016 248)
Step 200
200

#CBDBEC

oklch(88.5% 0.029 249.8)
Step 300
300

#A7C4E1

oklch(80.8% 0.052 248.5)
Step 400
400

#77A5D2

oklch(70.6% 0.083 248.5)
Step 500
500

#518EC7

oklch(63% 0.107 248.4)
Step 600
600 (this color)

#397DB9

oklch(57.4% 0.116 248)
Step 700
700

#25649A

oklch(49% 0.108 248.1)
Step 800
800

#21527D

oklch(42.7% 0.089 248.1)
Step 900
900

#204465

oklch(37.7% 0.07 248.4)
Step 950
950

#14283B

oklch(27% 0.044 248.6)

Export this scale for Tailwind in the Tailwind colors tool

#397DB9 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)	#6280BC	0.044
Deuteranopia (no green cones)	#5073B8	0.032
Tritanopia (no blue cones)	#008B92	0.087
Achromatopsia (no color)	#797979	0.116