#559CB2
Closest named color: Cadet Blue (#5F9EA0). oklch(65.5% 0.078 220.3), rgb(85, 156, 178).
Aa
Black text reads best on this color (6.78:1).
About this color
#559CB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.078 and its hue 220°. 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 6.78:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.78:1 |
| White text | 3.09:1 |
Values
| HEX | #559CB2 |
| RGB | rgb(85, 156, 178) |
| HSL | hsl(194, 38%, 52%) |
| OKLCH | oklch(65.5% 0.078 220.3) |
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 #559CB2 | 3.09:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #559CB2 | 6.78:1 | AA | Lc 46.3 | Large or bold text, headings |
| #559CB2 text on white | 3.09:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #559CB2 text on black | 6.78:1 | AA | Lc -44.0 | 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
#CBDDE3
oklch(88.6% 0.021 219.7)
-
Step 300
300
#A6C7D2
oklch(80.9% 0.039 220)
-
Step 400
400
#75AABB
oklch(70.7% 0.061 219.9)
-
Step 500
500 (this color)
#559CB2
oklch(65.5% 0.078 220.3)
-
Step 600
600
#2C7F96
oklch(55.7% 0.085 219.9)
-
Step 700
700
#1D6B80
oklch(49.1% 0.079 220.1)
-
Step 800
800
#1C5768
oklch(42.7% 0.065 220.7)
-
Step 900
900
#1E4854
oklch(37.7% 0.051 219.3)
-
Step 950
950
#132A31
oklch(27% 0.032 219.8)
#559CB2 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) | #8E98B3 | 0.065 |
| Deuteranopia (no green cones) | #818EB2 | 0.060 |
| Tritanopia (no blue cones) | #18A3A3 | 0.050 |
| Achromatopsia (no color) | #929292 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CB2
#559CB2
oklch(65.5% 0.078 220.3)
- #BA806C
#BA806C
oklch(65.4% 0.078 39.8)
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 #559CB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.030
- Greyblue #77A1B5 ΔE 0.040
- Blue Grey #758DA3 ΔE 0.049
- Silver Lake Blue #778DA9 ΔE 0.050
- Faded Blue #658CBB ΔE 0.053
- Sea #3C9992 ΔE 0.055
- Dull Teal #5F9E8F ΔE 0.055
- Bluegrey #85A3B2 ΔE 0.058
Use #559CB2 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.