#559EB3
Closest named color: Cadet Blue (#5F9EA0). oklch(66% 0.079 218.8), rgb(85, 158, 179).
Aa
Black text reads best on this color (6.92:1).
About this color
#559EB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.079 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.029 away. Black text reads best on it, at 6.92:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #559EB3 |
| RGB | rgb(85, 158, 179) |
| HSL | hsl(193, 38%, 52%) |
| OKLCH | oklch(66% 0.079 218.8) |
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 #559EB3 | 3.03:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #559EB3 | 6.92:1 | AA | Lc 47.1 | Large or bold text, headings |
| #559EB3 text on white | 3.03:1 | AA large text | Lc 56.9 | Large or bold text, headings |
| #559EB3 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
#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
#A6C7D2
oklch(80.9% 0.039 220)
-
Step 400
400
#74AABB
oklch(70.6% 0.062 219.6)
-
Step 500
500 (this color)
#559EB3
oklch(66% 0.079 218.8)
-
Step 600
600
#2A7F95
oklch(55.6% 0.086 218.6)
-
Step 700
700
#1A6B7F
oklch(49% 0.08 218.7)
-
Step 800
800
#1A5767
oklch(42.6% 0.066 218.9)
-
Step 900
900
#1D4854
oklch(37.7% 0.051 218.9)
-
Step 950
950
#122A31
oklch(26.9% 0.033 219.1)
#559EB3 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) | #919AB4 | 0.069 |
| Deuteranopia (no green cones) | #828FB3 | 0.062 |
| Tritanopia (no blue cones) | #14A5A5 | 0.049 |
| Achromatopsia (no color) | #949494 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EB3
#559EB3
oklch(66% 0.079 218.8)
- #BD826E
#BD826E
oklch(66.1% 0.079 39.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #559EB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.029
- Greyblue #77A1B5 ΔE 0.038
- Blue Grey #758DA3 ΔE 0.053
- Dull Teal #5F9E8F ΔE 0.054
- Silver Lake Blue #778DA9 ΔE 0.054
- Bluegrey #85A3B2 ΔE 0.056
- Sea #3C9992 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.057
Use #559EB3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.