#559FB1
Closest named color: Cadet Blue (#5F9EA0). oklch(66.2% 0.078 215.5), rgb(85, 159, 177).
Aa
Black text reads best on this color (6.98:1).
About this color
#559FB1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.078 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.025 away. Black text reads best on it, at 6.98:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.98:1 |
| White text | 3.00:1 |
Values
| HEX | #559FB1 |
| RGB | rgb(85, 159, 177) |
| HSL | hsl(192, 37%, 51%) |
| OKLCH | oklch(66.2% 0.078 215.5) |
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 #559FB1 | 3.00:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #559FB1 | 6.98:1 | AA | Lc 47.4 | Large or bold text, headings |
| #559FB1 text on white | 3.00:1 | AA large text | Lc 56.6 | Large or bold text, headings |
| #559FB1 text on black | 6.98:1 | AA | Lc -45.1 | 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
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE2
oklch(88.5% 0.022 215.3)
-
Step 300
300
#A6C7D0
oklch(80.8% 0.038 216.1)
-
Step 400
400
#74ABB9
oklch(70.8% 0.061 215.4)
-
Step 500
500 (this color)
#559FB1
oklch(66.2% 0.078 215.5)
-
Step 600
600
#298093
oklch(55.7% 0.085 215.4)
-
Step 700
700
#196C7D
oklch(49.2% 0.079 215.1)
-
Step 800
800
#195866
oklch(42.8% 0.066 215.8)
-
Step 900
900
#1C4853
oklch(37.6% 0.051 216.8)
-
Step 950
950
#122A30
oklch(26.8% 0.032 216)
#559FB1 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) | #929BB2 | 0.070 |
| Deuteranopia (no green cones) | #8490B1 | 0.064 |
| Tritanopia (no blue cones) | #17A6A4 | 0.047 |
| Achromatopsia (no color) | #959595 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FB1
#559FB1
oklch(66.2% 0.078 215.5)
- #BD8272
#BD8272
oklch(66.2% 0.077 35.8)
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 #559FB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.025
- Greyblue #77A1B5 ΔE 0.037
- Dull Teal #5F9E8F ΔE 0.050
- Sea #3C9992 ΔE 0.054
- Bluegrey #85A3B2 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.055
- Blue Grey #758DA3 ΔE 0.055
- Grey Teal #5E9B8A ΔE 0.056
Use #559FB1 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.