#559EBB
Closest named color: Greyblue (#77A1B5). oklch(66.3% 0.085 226.1), rgb(85, 158, 187).
Aa
Black text reads best on this color (6.99:1).
About this color
#559EBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.085 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.038 away. Black text reads best on it, at 6.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.99:1 |
| White text | 3.00:1 |
Values
| HEX | #559EBB |
| RGB | rgb(85, 158, 187) |
| HSL | hsl(197, 43%, 53%) |
| OKLCH | oklch(66.3% 0.085 226.1) |
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 #559EBB | 3.00:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #559EBB | 6.99:1 | AA | Lc 47.5 | Large or bold text, headings |
| #559EBB text on white | 3.00:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #559EBB text on black | 6.99:1 | AA | Lc -45.2 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D5
oklch(80.9% 0.041 224.8)
-
Step 400
400
#73AAC0
oklch(70.8% 0.066 225)
-
Step 500
500 (this color)
#559EBB
oklch(66.3% 0.085 226.1)
-
Step 600
600
#287E9C
oklch(55.6% 0.092 225.7)
-
Step 700
700
#196A86
oklch(49.1% 0.086 226.6)
-
Step 800
800
#19576D
oklch(42.8% 0.071 226.1)
-
Step 900
900
#1C4758
oklch(37.6% 0.055 227.1)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#559EBB 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) | #8E9BBD | 0.064 |
| Deuteranopia (no green cones) | #8090BB | 0.058 |
| Tritanopia (no blue cones) | #00A7A7 | 0.060 |
| Achromatopsia (no color) | #959595 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EBB
#559EBB
oklch(66.3% 0.085 226.1)
- #BF8367
#BF8367
oklch(66.4% 0.085 45.8)
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 #559EBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.038
- Cadet Blue #5F9EA0 ΔE 0.041
- Faded Blue #658CBB ΔE 0.052
- Silver Lake Blue #778DA9 ΔE 0.055
- Blue Grey #758DA3 ΔE 0.056
- Bluegrey #85A3B2 ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.057
- Bluey Grey #89A0B0 ΔE 0.059
Use #559EBB 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.