#559D9D
Closest named color: Cadet Blue (#5F9EA0). oklch(64.9% 0.072 195.5), rgb(85, 157, 157).
Aa
Black text reads best on this color (6.69:1).
About this color
#559D9D is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.072 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.012 away. Black text reads best on it, at 6.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.69:1 |
| White text | 3.13:1 |
Values
| HEX | #559D9D |
| RGB | rgb(85, 157, 157) |
| HSL | hsl(180, 30%, 47%) |
| OKLCH | oklch(64.9% 0.072 195.5) |
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 #559D9D | 3.13:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #559D9D | 6.69:1 | AA | Lc 45.8 | Large or bold text, headings |
| #559D9D text on white | 3.13:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #559D9D text on black | 6.69:1 | AA | Lc -43.5 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDD
oklch(88.4% 0.019 196.8)
-
Step 300
300
#A7C8C8
oklch(80.9% 0.035 196.5)
-
Step 400
400
#76ACAC
oklch(70.7% 0.057 195.9)
-
Step 500
500 (this color)
#559D9D
oklch(64.9% 0.072 195.5)
-
Step 600
600
#2E8282
oklch(55.7% 0.079 195.1)
-
Step 700
700
#206D6E
oklch(49% 0.073 196.3)
-
Step 800
800
#1D5959
oklch(42.6% 0.06 195.1)
-
Step 900
900
#1F494A
oklch(37.6% 0.047 197.4)
-
Step 950
950
#132B2B
oklch(27% 0.03 195.5)
#559D9D 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) | #95979D | 0.076 |
| Deuteranopia (no green cones) | #888D9E | 0.071 |
| Tritanopia (no blue cones) | #2FA19D | 0.027 |
| Achromatopsia (no color) | #919191 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559D9D
#559D9D
oklch(64.9% 0.072 195.5)
- #B77D80
#B77D80
oklch(64.9% 0.073 15.9)
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 #559D9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.012
- Dull Teal #5F9E8F ΔE 0.023
- Grey Teal #5E9B8A ΔE 0.027
- Sea #3C9992 ΔE 0.030
- Persian Green #2A9D8F ΔE 0.039
- Dusty Teal #4C9085 ΔE 0.047
- Blue Green #0F9B8E ΔE 0.048
- Greyblue #77A1B5 ΔE 0.054
Use #559D9D 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.