#509DB2

Closest named color: Cadet Blue (#5F9EA0). oklch(65.5% 0.082 217.9), rgb(80, 157, 178).

Black text reads best on this color (6.80:1).

About this color

#509DB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.082 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.030 away. Black text reads best on it, at 6.80:1.

Hue family	Teals and cyans
Lightness	medium-light (66%)
Chroma	moderately saturated (0.082)
Temperature	cool
Nearest name	Cadet Blue (#5F9EA0)
Black text	6.80:1
White text	3.08:1

Values

HEX	#509DB2
RGB	rgb(80, 157, 178)
HSL	hsl(193, 39%, 51%)
OKLCH	oklch(65.5% 0.082 217.9)

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 #509DB2	3.08:1	AA large text	Lc -63.0	Content text, not long reading
Black text on #509DB2	6.80:1	AA	Lc 46.4	Large or bold text, headings
#509DB2 text on white	3.08:1	AA large text	Lc 57.6	Large or bold text, headings
#509DB2 text on black	6.80:1	AA	Lc -44.1	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

#F2F6F8

oklch(97.1% 0.005 228.8)
Step 100
100

#E2ECEF

oklch(93.6% 0.011 217.5)
Step 200
200

#CADDE3

oklch(88.5% 0.022 218.6)
Step 300
300

#A5C7D2

oklch(80.8% 0.04 219.4)
Step 400
400

#72ABBB

oklch(70.8% 0.064 217.3)
Step 500
500 (this color)

#509DB2

oklch(65.5% 0.082 217.9)
Step 600
600

#238096

oklch(55.7% 0.089 217.5)
Step 700
700

#136C80

oklch(49.2% 0.083 217.7)
Step 800
800

#155868

oklch(42.8% 0.069 217.8)
Step 900
900

#1A4854

oklch(37.6% 0.053 217.9)
Step 950
950

#112A31

oklch(26.8% 0.033 218.4)

Export this scale for Tailwind in the Tailwind colors tool

#509DB2 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)	#8F99B3	0.071
Deuteranopia (no green cones)	#818EB2	0.064
Tritanopia (no blue cones)	#00A4A4	0.048
Achromatopsia (no color)	#939393	0.082