#559BB4
Closest named color: Cadet Blue (#5F9EA0). oklch(65.3% 0.08 223.4), rgb(85, 155, 180).
Aa
Black text reads best on this color (6.73:1).
About this color
#559BB4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.080 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.035 away. Black text reads best on it, at 6.73:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.73:1 |
| White text | 3.11:1 |
Values
| HEX | #559BB4 |
| RGB | rgb(85, 155, 180) |
| HSL | hsl(196, 39%, 52%) |
| OKLCH | oklch(65.3% 0.08 223.4) |
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 #559BB4 | 3.11:1 | AA large text | Lc -63.4 | Content text, not long reading |
| Black text on #559BB4 | 6.73:1 | AA | Lc 46.0 | Large or bold text, headings |
| #559BB4 text on white | 3.11:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #559BB4 text on black | 6.73:1 | AA | Lc -43.7 | 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 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
#CBDDE4
oklch(88.6% 0.022 223)
-
Step 300
300
#A6C7D3
oklch(80.9% 0.039 221.9)
-
Step 400
400
#75AABD
oklch(70.8% 0.062 222.4)
-
Step 500
500 (this color)
#559BB4
oklch(65.3% 0.08 223.4)
-
Step 600
600
#2D7E98
oklch(55.6% 0.086 223.1)
-
Step 700
700
#1E6A82
oklch(49% 0.081 223.6)
-
Step 800
800
#1C576A
oklch(42.8% 0.067 223.2)
-
Step 900
900
#1E4856
oklch(37.8% 0.052 222.7)
-
Step 950
950
#132A32
oklch(27% 0.033 222.8)
#559BB4 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) | #8D98B5 | 0.064 |
| Deuteranopia (no green cones) | #7F8DB4 | 0.058 |
| Tritanopia (no blue cones) | #15A3A3 | 0.054 |
| Achromatopsia (no color) | #929292 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BB4
#559BB4
oklch(65.3% 0.08 223.4)
- #BA8068
#BA8068
oklch(65.3% 0.08 43.3)
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 #559BB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.035
- Greyblue #77A1B5 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.048
- Faded Blue #658CBB ΔE 0.049
- Sea #3C9992 ΔE 0.058
- Dusty Blue #5A86AD ΔE 0.058
- Dull Teal #5F9E8F ΔE 0.059
Use #559BB4 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.