#559DAE
Closest named color: Cadet Blue (#5F9EA0). oklch(65.6% 0.076 214.9), rgb(85, 157, 174).
Aa
Black text reads best on this color (6.82:1).
About this color
#559DAE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.076 and its hue 215°. 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 6.82:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #559DAE |
| RGB | rgb(85, 157, 174) |
| HSL | hsl(191, 35%, 51%) |
| OKLCH | oklch(65.6% 0.076 214.9) |
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 #559DAE | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #559DAE | 6.82:1 | AA | Lc 46.5 | Large or bold text, headings |
| #559DAE text on white | 3.07:1 | AA large text | Lc 57.6 | Large or bold text, headings |
| #559DAE 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
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CBDDE2
oklch(88.6% 0.021 216.2)
-
Step 300
300
#A6C7D0
oklch(80.8% 0.038 216.1)
-
Step 400
400
#75ABB8
oklch(70.8% 0.06 214.4)
-
Step 500
500 (this color)
#559DAE
oklch(65.6% 0.076 214.9)
-
Step 600
600
#2C7F92
oklch(55.5% 0.083 216)
-
Step 700
700
#1D6C7C
oklch(49.2% 0.077 214.5)
-
Step 800
800
#1B5865
oklch(42.8% 0.064 214.8)
-
Step 900
900
#1E4852
oklch(37.6% 0.049 215.6)
-
Step 950
950
#132A30
oklch(26.9% 0.031 216.7)
#559DAE 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) | #9199AF | 0.069 |
| Deuteranopia (no green cones) | #838EAE | 0.063 |
| Tritanopia (no blue cones) | #1DA4A2 | 0.045 |
| Achromatopsia (no color) | #939393 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DAE
#559DAE
oklch(65.6% 0.076 214.9)
- #BB8071
#BB8071
oklch(65.6% 0.077 34.9)
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 #559DAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.023
- Greyblue #77A1B5 ΔE 0.040
- Dull Teal #5F9E8F ΔE 0.048
- Sea #3C9992 ΔE 0.049
- Blue Grey #758DA3 ΔE 0.051
- Grey Teal #5E9B8A ΔE 0.052
- Silver Lake Blue #778DA9 ΔE 0.053
- Bluegrey #85A3B2 ΔE 0.058
Use #559DAE 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.