#559CBC
Closest named color: Greyblue (#77A1B5). oklch(65.9% 0.086 229.3), rgb(85, 156, 188).
Aa
Black text reads best on this color (6.86:1).
About this color
#559CBC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.086 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.041 away. Black text reads best on it, at 6.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #559CBC |
| RGB | rgb(85, 156, 188) |
| HSL | hsl(199, 43%, 54%) |
| OKLCH | oklch(65.9% 0.086 229.3) |
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 #559CBC | 3.05:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #559CBC | 6.86:1 | AA | Lc 46.8 | Large or bold text, headings |
| #559CBC text on white | 3.05:1 | AA large text | Lc 57.3 | Large or bold text, headings |
| #559CBC text on black | 6.86:1 | AA | Lc -44.5 | 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
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#74A9C2
oklch(70.7% 0.067 229.1)
-
Step 500
500 (this color)
#559CBC
oklch(65.9% 0.086 229.3)
-
Step 600
600
#2B7D9F
oklch(55.6% 0.093 229.7)
-
Step 700
700
#1C6988
oklch(49% 0.087 229.9)
-
Step 800
800
#1A566E
oklch(42.7% 0.072 228.9)
-
Step 900
900
#1D4759
oklch(37.7% 0.056 229)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#559CBC 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) | #8C9ABE | 0.062 |
| Deuteranopia (no green cones) | #7D8FBC | 0.054 |
| Tritanopia (no blue cones) | #00A5A6 | 0.063 |
| Achromatopsia (no color) | #939393 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CBC
#559CBC
oklch(65.9% 0.086 229.3)
- #BD8262
#BD8262
oklch(65.9% 0.086 49.2)
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 #559CBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.041
- Cadet Blue #5F9EA0 ΔE 0.045
- Faded Blue #658CBB ΔE 0.046
- Silver Lake Blue #778DA9 ΔE 0.052
- Blue Grey #758DA3 ΔE 0.053
- Bluegrey #85A3B2 ΔE 0.060
- Dusty Blue #5A86AD ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.062
Use #559CBC 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.