#559EA1
Closest named color: Cadet Blue (#5F9EA0). oklch(65.3% 0.073 199), rgb(85, 158, 161).
Aa
Black text reads best on this color (6.79:1).
About this color
#559EA1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.073 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.009 away. Black text reads best on it, at 6.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.79:1 |
| White text | 3.09:1 |
Values
| HEX | #559EA1 |
| RGB | rgb(85, 158, 161) |
| HSL | hsl(182, 31%, 48%) |
| OKLCH | oklch(65.3% 0.073 199) |
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 #559EA1 | 3.09:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #559EA1 | 6.79:1 | AA | Lc 46.3 | Large or bold text, headings |
| #559EA1 text on white | 3.09:1 | AA large text | Lc 57.7 | Large or bold text, headings |
| #559EA1 text on black | 6.79:1 | AA | Lc -44.0 | Non-text elements, placeholder text |
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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A7C8C9
oklch(80.9% 0.035 198.7)
-
Step 400
400
#75ACAE
oklch(70.7% 0.058 198.8)
-
Step 500
500 (this color)
#559EA1
oklch(65.3% 0.073 199)
-
Step 600
600
#2C8185
oklch(55.5% 0.08 199.6)
-
Step 700
700
#1E6D71
oklch(49.1% 0.074 200)
-
Step 800
800
#1C595C
oklch(42.7% 0.061 199.8)
-
Step 900
900
#1E494B
oklch(37.6% 0.047 199.4)
-
Step 950
950
#132B2C
oklch(27% 0.03 199.1)
#559EA1 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) | #9598A1 | 0.075 |
| Deuteranopia (no green cones) | #888EA2 | 0.071 |
| Tritanopia (no blue cones) | #2BA29F | 0.030 |
| Achromatopsia (no color) | #929292 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EA1
#559EA1
oklch(65.3% 0.073 199)
- #B97E7E
#B97E7E
oklch(65.3% 0.074 19.2)
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 #559EA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.009
- Dull Teal #5F9E8F ΔE 0.027
- Grey Teal #5E9B8A ΔE 0.032
- Sea #3C9992 ΔE 0.034
- Persian Green #2A9D8F ΔE 0.043
- Greyblue #77A1B5 ΔE 0.050
- Blue Green #0F9B8E ΔE 0.052
- Dusty Teal #4C9085 ΔE 0.053
Use #559EA1 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.