#559FBE
Closest named color: Greyblue (#77A1B5). oklch(66.7% 0.087 227.5), rgb(85, 159, 190).
Aa
Black text reads best on this color (7.08:1).
About this color
#559FBE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.087 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.038 away. Black text reads best on it, at 7.08:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.08:1 |
| White text | 2.96:1 |
Values
| HEX | #559FBE |
| RGB | rgb(85, 159, 190) |
| HSL | hsl(198, 45%, 54%) |
| OKLCH | oklch(66.7% 0.087 227.5) |
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 #559FBE | 2.96:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #559FBE | 7.08:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #559FBE text on white | 2.96:1 | Fails | Lc 56.0 | Large or bold text, headings |
| #559FBE text on black | 7.08:1 | AAA | Lc -45.8 | Large or bold text, headings |
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
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D6
oklch(81% 0.042 226.4)
-
Step 400
400
#72AAC2
oklch(70.8% 0.068 226.8)
-
Step 500
500 (this color)
#559FBE
oklch(66.7% 0.087 227.5)
-
Step 600
600
#267E9E
oklch(55.6% 0.094 227)
-
Step 700
700
#176A87
oklch(49.1% 0.087 227.1)
-
Step 800
800
#17566E
oklch(42.6% 0.073 228.2)
-
Step 900
900
#1B4759
oklch(37.6% 0.057 228.1)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#559FBE 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) | #8F9CC0 | 0.065 |
| Deuteranopia (no green cones) | #8091BE | 0.057 |
| Tritanopia (no blue cones) | #00A8A9 | 0.061 |
| Achromatopsia (no color) | #969696 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FBE
#559FBE
oklch(66.7% 0.087 227.5)
- #C18465
#C18465
oklch(66.8% 0.087 47.7)
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 #559FBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.038
- Cadet Blue #5F9EA0 ΔE 0.045
- Faded Blue #658CBB ΔE 0.053
- Turquoise Blue #06B1C4 ΔE 0.055
- Bluegrey #85A3B2 ΔE 0.056
- Silver Lake Blue #778DA9 ΔE 0.057
- Blue Grey #758DA3 ΔE 0.059
- Bluey Grey #89A0B0 ΔE 0.059
Use #559FBE 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.