#559BAF
Closest named color: Cadet Blue (#5F9EA0). oklch(65.1% 0.076 218.5), rgb(85, 155, 175).
Aa
Black text reads best on this color (6.69:1).
About this color
#559BAF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.076 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.028 away. Black text reads best on it, at 6.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.69:1 |
| White text | 3.13:1 |
Values
| HEX | #559BAF |
| RGB | rgb(85, 155, 175) |
| HSL | hsl(193, 36%, 51%) |
| OKLCH | oklch(65.1% 0.076 218.5) |
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 #559BAF | 3.13:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #559BAF | 6.69:1 | AA | Lc 45.8 | Large or bold text, headings |
| #559BAF text on white | 3.13:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #559BAF 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CBDDE2
oklch(88.6% 0.021 216.2)
-
Step 300
300
#A7C7D1
oklch(80.9% 0.037 218.7)
-
Step 400
400
#76AABA
oklch(70.7% 0.06 219)
-
Step 500
500 (this color)
#559BAF
oklch(65.1% 0.076 218.5)
-
Step 600
600
#2E7F94
oklch(55.7% 0.083 218.3)
-
Step 700
700
#1F6B7E
oklch(49.1% 0.077 218.3)
-
Step 800
800
#1D5766
oklch(42.6% 0.064 218.2)
-
Step 900
900
#1F4853
oklch(37.7% 0.049 217.8)
-
Step 950
950
#132A31
oklch(27% 0.032 219.8)
#559BAF 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) | #8E97B0 | 0.066 |
| Deuteranopia (no green cones) | #818DAF | 0.060 |
| Tritanopia (no blue cones) | #1DA2A1 | 0.048 |
| Achromatopsia (no color) | #919191 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BAF
#559BAF
oklch(65.1% 0.076 218.5)
- #B9806D
#B9806D
oklch(65.3% 0.077 39.2)
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 #559BAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.028
- Greyblue #77A1B5 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.049
- Sea #3C9992 ΔE 0.051
- Dull Teal #5F9E8F ΔE 0.052
- Faded Blue #658CBB ΔE 0.053
- Grey Teal #5E9B8A ΔE 0.056
Use #559BAF 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.