#559DB7
Closest named color: Cadet Blue (#5F9EA0). oklch(65.9% 0.082 223.8), rgb(85, 157, 183).
Aa
Black text reads best on this color (6.89:1).
About this color
#559DB7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.082 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.036 away. Black text reads best on it, at 6.89:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.89:1 |
| White text | 3.04:1 |
Values
| HEX | #559DB7 |
| RGB | rgb(85, 157, 183) |
| HSL | hsl(196, 40%, 53%) |
| OKLCH | oklch(65.9% 0.082 223.8) |
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 #559DB7 | 3.04:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #559DB7 | 6.89:1 | AA | Lc 46.9 | Large or bold text, headings |
| #559DB7 text on white | 3.04:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #559DB7 text on black | 6.89:1 | AA | Lc -44.6 | 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
#CADDE4
oklch(88.5% 0.023 221.8)
-
Step 300
300
#A6C7D4
oklch(81% 0.04 223.7)
-
Step 400
400
#74AABE
oklch(70.8% 0.064 223.2)
-
Step 500
500 (this color)
#559DB7
oklch(65.9% 0.082 223.8)
-
Step 600
600
#2A7E9A
oklch(55.6% 0.089 224.3)
-
Step 700
700
#1B6A83
oklch(49% 0.083 224.1)
-
Step 800
800
#1A576B
oklch(42.8% 0.069 224)
-
Step 900
900
#1D4856
oklch(37.8% 0.053 222.3)
-
Step 950
950
#122A33
oklch(27% 0.034 224.8)
#559DB7 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) | #8E9AB8 | 0.065 |
| Deuteranopia (no green cones) | #808FB7 | 0.058 |
| Tritanopia (no blue cones) | #0CA5A5 | 0.056 |
| Achromatopsia (no color) | #949494 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DB7
#559DB7
oklch(65.9% 0.082 223.8)
- #BD8269
#BD8269
oklch(66% 0.082 43.8)
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 #559DB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.036
- Greyblue #77A1B5 ΔE 0.039
- Faded Blue #658CBB ΔE 0.052
- Silver Lake Blue #778DA9 ΔE 0.052
- Blue Grey #758DA3 ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.059
- Bluey Grey #89A0B0 ΔE 0.059
Use #559DB7 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.