#559DBD
Closest named color: Greyblue (#77A1B5). oklch(66.2% 0.086 228.9), rgb(85, 157, 189).
Aa
Black text reads best on this color (6.94:1).
About this color
#559DBD 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 0.040 away. Black text reads best on it, at 6.94:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.94:1 |
| White text | 3.02:1 |
Values
| HEX | #559DBD |
| RGB | rgb(85, 157, 189) |
| HSL | hsl(198, 44%, 54%) |
| OKLCH | oklch(66.2% 0.086 228.9) |
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 #559DBD | 3.02:1 | AA large text | Lc -62.2 | Content text, not long reading |
| Black text on #559DBD | 6.94:1 | AA | Lc 47.2 | Large or bold text, headings |
| #559DBD text on white | 3.02:1 | AA large text | Lc 56.8 | Large or bold text, headings |
| #559DBD text on black | 6.94:1 | AA | Lc -44.9 | 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
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A5C6D7
oklch(80.8% 0.043 230.3)
-
Step 400
400
#73A9C2
oklch(70.6% 0.067 228.7)
-
Step 500
500 (this color)
#559DBD
oklch(66.2% 0.086 228.9)
-
Step 600
600
#297D9F
oklch(55.5% 0.094 229.3)
-
Step 700
700
#1A6A88
oklch(49.2% 0.087 228.5)
-
Step 800
800
#19566E
oklch(42.6% 0.072 228.6)
-
Step 900
900
#1C4759
oklch(37.6% 0.056 228.6)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#559DBD 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) | #8D9BBF | 0.063 |
| Deuteranopia (no green cones) | #7E8FBD | 0.056 |
| Tritanopia (no blue cones) | #00A6A7 | 0.062 |
| Achromatopsia (no color) | #949494 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DBD
#559DBD
oklch(66.2% 0.086 228.9)
- #BE8363
#BE8363
oklch(66.2% 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 #559DBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Cadet Blue #5F9EA0 ΔE 0.045
- Faded Blue #658CBB ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.054
- Blue Grey #758DA3 ΔE 0.055
- Bluegrey #85A3B2 ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.061
Use #559DBD 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.