#559EA5
Closest named color: Cadet Blue (#5F9EA0). oklch(65.5% 0.074 203.6), rgb(85, 158, 165).
Aa
Black text reads best on this color (6.82:1).
About this color
#559EA5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.074 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.011 away. Black text reads best on it, at 6.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #559EA5 |
| RGB | rgb(85, 158, 165) |
| HSL | hsl(185, 32%, 49%) |
| OKLCH | oklch(65.5% 0.074 203.6) |
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 #559EA5 | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #559EA5 | 6.82:1 | AA | Lc 46.5 | Large or bold text, headings |
| #559EA5 text on white | 3.07:1 | AA large text | Lc 57.6 | Large or bold text, headings |
| #559EA5 text on black | 6.82:1 | AA | Lc -44.2 | 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CBDDDF
oklch(88.5% 0.019 204.8)
-
Step 300
300
#A6C8CB
oklch(80.9% 0.037 203)
-
Step 400
400
#75ACB1
oklch(70.8% 0.058 203.1)
-
Step 500
500 (this color)
#559EA5
oklch(65.5% 0.074 203.6)
-
Step 600
600
#2C8189
oklch(55.7% 0.08 204)
-
Step 700
700
#1D6D74
oklch(49.1% 0.075 203.7)
-
Step 800
800
#1B595E
oklch(42.7% 0.062 202.8)
-
Step 900
900
#1E494D
oklch(37.7% 0.048 203.6)
-
Step 950
950
#132B2D
oklch(27.1% 0.03 202.6)
#559EA5 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) | #9499A6 | 0.074 |
| Deuteranopia (no green cones) | #878FA5 | 0.068 |
| Tritanopia (no blue cones) | #27A3A0 | 0.034 |
| Achromatopsia (no color) | #939393 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EA5
#559EA5
oklch(65.5% 0.074 203.6)
- #BA7F7B
#BA7F7B
oklch(65.5% 0.074 23.6)
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 #559EA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.011
- Dull Teal #5F9E8F ΔE 0.033
- Grey Teal #5E9B8A ΔE 0.038
- Sea #3C9992 ΔE 0.038
- Greyblue #77A1B5 ΔE 0.046
- Persian Green #2A9D8F ΔE 0.048
- Blue Grey #758DA3 ΔE 0.056
- Blue Green #0F9B8E ΔE 0.056
Use #559EA5 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.