#559DBF
Closest named color: Greyblue (#77A1B5). oklch(66.3% 0.088 230.5), rgb(85, 157, 191).
Aa
Black text reads best on this color (6.96:1).
About this color
#559DBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.088 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.041 away. Black text reads best on it, at 6.96:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.96:1 |
| White text | 3.01:1 |
Values
| HEX | #559DBF |
| RGB | rgb(85, 157, 191) |
| HSL | hsl(199, 45%, 54%) |
| OKLCH | oklch(66.3% 0.088 230.5) |
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 #559DBF | 3.01:1 | AA large text | Lc -62.1 | Content text, not long reading |
| Black text on #559DBF | 6.96:1 | AA | Lc 47.3 | Large or bold text, headings |
| #559DBF text on white | 3.01:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #559DBF text on black | 6.96:1 | AA | Lc -45.0 | 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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A5C6D8
oklch(80.8% 0.044 231.9)
-
Step 400
400
#73A9C4
oklch(70.7% 0.069 230.7)
-
Step 500
500 (this color)
#559DBF
oklch(66.3% 0.088 230.5)
-
Step 600
600
#297DA1
oklch(55.6% 0.096 230.8)
-
Step 700
700
#1A698A
oklch(49% 0.089 231.2)
-
Step 800
800
#195670
oklch(42.7% 0.074 230.7)
-
Step 900
900
#1C475A
oklch(37.7% 0.057 230)
-
Step 950
950
#122A35
oklch(27.1% 0.036 229.8)
#559DBF 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) | #8C9BC1 | 0.062 |
| Deuteranopia (no green cones) | #7D90BF | 0.053 |
| Tritanopia (no blue cones) | #00A6A8 | 0.063 |
| Achromatopsia (no color) | #949494 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DBF
#559DBF
oklch(66.3% 0.088 230.5)
- #BF8361
#BF8361
oklch(66.3% 0.088 50.2)
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 #559DBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.041
- Faded Blue #658CBB ΔE 0.047
- Cadet Blue #5F9EA0 ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.054
- Blue Grey #758DA3 ΔE 0.057
- Bluegrey #85A3B2 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.062
Use #559DBF 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.