#559DC5
Closest named color: Greyblue (#77A1B5). oklch(66.5% 0.094 234.9), rgb(85, 157, 197).
Aa
Black text reads best on this color (7.01:1).
About this color
#559DC5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.094 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.045 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #559DC5 |
| RGB | rgb(85, 157, 197) |
| HSL | hsl(201, 49%, 55%) |
| OKLCH | oklch(66.5% 0.094 234.9) |
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 #559DC5 | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #559DC5 | 7.01:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #559DC5 text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #559DC5 text on black | 7.01:1 | AAA | Lc -45.4 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#72A8C8
oklch(70.6% 0.074 235.3)
-
Step 500
500 (this color)
#559DC5
oklch(66.5% 0.094 234.9)
-
Step 600
600
#287CA6
oklch(55.6% 0.102 235)
-
Step 700
700
#19688E
oklch(49% 0.094 235.1)
-
Step 800
800
#185574
oklch(42.6% 0.079 235.6)
-
Step 900
900
#1C475D
oklch(37.8% 0.06 233.9)
-
Step 950
950
#122937
oklch(26.9% 0.039 237.4)
#559DC5 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) | #8A9CC7 | 0.059 |
| Deuteranopia (no green cones) | #7A90C4 | 0.050 |
| Tritanopia (no blue cones) | #00A8AA | 0.071 |
| Achromatopsia (no color) | #959595 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DC5
#559DC5
oklch(66.5% 0.094 234.9)
- #C0845B
#C0845B
oklch(66.5% 0.093 54.8)
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 #559DC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.045
- Faded Blue #658CBB ΔE 0.046
- Cadet Blue #5F9EA0 ΔE 0.057
- Silver Lake Blue #778DA9 ΔE 0.058
- Blue Grey #758DA3 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.063
- Bluey Grey #89A0B0 ΔE 0.065
Use #559DC5 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.