#559AA9
Closest named color: Cadet Blue (#5F9EA0). oklch(64.7% 0.073 213.4), rgb(85, 154, 169).
Aa
Black text reads best on this color (6.58:1).
About this color
#559AA9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.073 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.023 away. Black text reads best on it, at 6.58:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.58:1 |
| White text | 3.19:1 |
Values
| HEX | #559AA9 |
| RGB | rgb(85, 154, 169) |
| HSL | hsl(191, 33%, 50%) |
| OKLCH | oklch(64.7% 0.073 213.4) |
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 #559AA9 | 3.19:1 | AA large text | Lc -64.4 | Content text, not long reading |
| Black text on #559AA9 | 6.58:1 | AA | Lc 45.1 | Large or bold text, headings |
| #559AA9 text on white | 3.19:1 | AA large text | Lc 58.9 | Large or bold text, headings |
| #559AA9 text on black | 6.58:1 | AA | Lc -42.8 | 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
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CBDDE1
oklch(88.5% 0.02 212.6)
-
Step 300
300
#A7C7CF
oklch(80.9% 0.036 214.5)
-
Step 400
400
#77AAB6
oklch(70.6% 0.057 214)
-
Step 500
500 (this color)
#559AA9
oklch(64.7% 0.073 213.4)
-
Step 600
600
#307F8F
oklch(55.5% 0.079 213.5)
-
Step 700
700
#216B7A
oklch(49% 0.074 214)
-
Step 800
800
#1E5863
oklch(42.8% 0.061 212.5)
-
Step 900
900
#1F4851
oklch(37.6% 0.048 214.1)
-
Step 950
950
#132A2F
oklch(26.9% 0.03 213.4)
#559AA9 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) | #8F96AA | 0.068 |
| Deuteranopia (no green cones) | #818CA9 | 0.061 |
| Tritanopia (no blue cones) | #25A09F | 0.041 |
| Achromatopsia (no color) | #909090 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559AA9
#559AA9
oklch(64.7% 0.073 213.4)
- #B67E71
#B67E71
oklch(64.6% 0.073 33.6)
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 #559AA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.023
- Sea #3C9992 ΔE 0.043
- Dull Teal #5F9E8F ΔE 0.045
- Blue Grey #758DA3 ΔE 0.046
- Greyblue #77A1B5 ΔE 0.047
- Grey Teal #5E9B8A ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.050
- Persian Green #2A9D8F ΔE 0.056
Use #559AA9 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.