#559FC3
Closest named color: Greyblue (#77A1B5). oklch(66.9% 0.091 231.4), rgb(85, 159, 195).
Aa
Black text reads best on this color (7.13:1).
About this color
#559FC3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.091 and its hue 231°. 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 7.13:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.13:1 |
| White text | 2.94:1 |
Values
| HEX | #559FC3 |
| RGB | rgb(85, 159, 195) |
| HSL | hsl(200, 48%, 55%) |
| OKLCH | oklch(66.9% 0.091 231.4) |
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 #559FC3 | 2.94:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #559FC3 | 7.13:1 | AAA | Lc 48.3 | Large or bold text, headings |
| #559FC3 text on white | 2.94:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #559FC3 text on black | 7.13:1 | AAA | Lc -46.0 | 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 400.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C5DDEB
oklch(88.4% 0.032 233.3)
-
Step 300
300
#9CC8DF
oklch(80.9% 0.057 231.1)
-
Step 400
400 (this color)
#559FC3
oklch(66.9% 0.091 231.4)
-
Step 500
500
#2795C3
oklch(63.1% 0.116 231.5)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005776
oklch(42.8% 0.087 231.2)
-
Step 900
900
#014862
oklch(37.7% 0.075 231)
-
Step 950
950
#072A3A
oklch(26.9% 0.049 232.7)
#559FC3 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) | #8D9DC5 | 0.062 |
| Deuteranopia (no green cones) | #7E91C2 | 0.055 |
| Tritanopia (no blue cones) | #00A9AB | 0.065 |
| Achromatopsia (no color) | #969696 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FC3
#559FC3
oklch(66.9% 0.091 231.4)
- #C28560
#C28560
oklch(67% 0.091 51.8)
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 #559FC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Faded Blue #658CBB ΔE 0.052
- Cadet Blue #5F9EA0 ΔE 0.052
- Turquoise Blue #06B1C4 ΔE 0.057
- Bluegrey #85A3B2 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.061
- Blue Grey #758DA3 ΔE 0.062
Use #559FC3 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.