#559FAA

Closest named color: Cadet Blue (#5F9EA0). oklch(65.9% 0.075 208), rgb(85, 159, 170).

Black text reads best on this color (6.92:1).

About this color

#559FAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.075 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.016 away. Black text reads best on it, at 6.92:1.

Hue family	Teals and cyans
Lightness	medium-light (66%)
Chroma	moderately saturated (0.075)
Temperature	cool
Nearest name	Cadet Blue (#5F9EA0)
Black text	6.92:1
White text	3.03:1

Values

HEX	#559FAA
RGB	rgb(85, 159, 170)
HSL	hsl(188, 33%, 50%)
OKLCH	oklch(65.9% 0.075 208)

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 #559FAA	3.03:1	AA large text	Lc -62.3	Content text, not long reading
Black text on #559FAA	6.92:1	AA	Lc 47.1	Large or bold text, headings
#559FAA text on white	3.03:1	AA large text	Lc 56.9	Large or bold text, headings
#559FAA text on black	6.92:1	AA	Lc -44.8	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

#F2F6F7

oklch(97% 0.004 214.3)
Step 100
100

#E2ECED

oklch(93.6% 0.011 204.1)
Step 200
200

#CADDE0

oklch(88.4% 0.021 208.1)
Step 300
300

#A6C8CD

oklch(81% 0.037 207.3)
Step 400
400

#74ABB4

oklch(70.6% 0.059 208.8)
Step 500
500 (this color)

#559FAA

oklch(65.9% 0.075 208)
Step 600
600

#2A818C

oklch(55.7% 0.082 207.1)
Step 700
700

#1B6D77

oklch(49.2% 0.076 207.1)
Step 800
800

#1A5861

oklch(42.6% 0.063 208.9)
Step 900
900

#1D494F

oklch(37.7% 0.049 207.4)
Step 950
950

#122B2E

oklch(27.1% 0.031 205.7)

Export this scale for Tailwind in the Tailwind colors tool

#559FAA 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)	#949AAB	0.073
Deuteranopia (no green cones)	#8690AA	0.066
Tritanopia (no blue cones)	#21A5A2	0.039
Achromatopsia (no color)	#949494	0.076