#559CCF
Closest named color: Faded Blue (#658CBB). oklch(66.8% 0.104 241.8), rgb(85, 156, 207).
Aa
Black text reads best on this color (7.04:1).
About this color
#559CCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.104 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.047 away. Black text reads best on it, at 7.04:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.04:1 |
| White text | 2.98:1 |
Values
| HEX | #559CCF |
| RGB | rgb(85, 156, 207) |
| HSL | hsl(205, 56%, 57%) |
| OKLCH | oklch(66.8% 0.104 241.8) |
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 #559CCF | 2.98:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #559CCF | 7.04:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #559CCF text on white | 2.98:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #559CCF text on black | 7.04:1 | AAA | Lc -45.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5DF
oklch(80.8% 0.051 242)
-
Step 400
400
#72A7CF
oklch(70.7% 0.081 241.9)
-
Step 500
500 (this color)
#559CCF
oklch(66.8% 0.104 241.8)
-
Step 600
600
#277AB0
oklch(55.6% 0.114 242.1)
-
Step 700
700
#186797
oklch(49.2% 0.105 241.5)
-
Step 800
800
#18547A
oklch(42.7% 0.087 241.4)
-
Step 900
900
#1B4562
oklch(37.5% 0.068 242)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#559CCF 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) | #859CD1 | 0.053 |
| Deuteranopia (no green cones) | #7590CE | 0.044 |
| Tritanopia (no blue cones) | #00A9AD | 0.082 |
| Achromatopsia (no color) | #959595 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CCF
#559CCF
oklch(66.8% 0.104 241.8)
- #C2854D
#C2854D
oklch(66.7% 0.104 62)
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 #559CCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.056
- Greyblue #77A1B5 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.065
- Dusty Blue #5A86AD ΔE 0.070
- Blue Grey #758DA3 ΔE 0.071
Use #559CCF 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.