#559E99
Closest named color: Cadet Blue (#5F9EA0). oklch(65.1% 0.074 189.7), rgb(85, 158, 153).
Aa
Black text reads best on this color (6.73:1).
About this color
#559E99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.074 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.015 away. Black text reads best on it, at 6.73:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.73:1 |
| White text | 3.11:1 |
Values
| HEX | #559E99 |
| RGB | rgb(85, 158, 153) |
| HSL | hsl(176, 30%, 48%) |
| OKLCH | oklch(65.1% 0.074 189.7) |
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 #559E99 | 3.11:1 | AA large text | Lc -63.4 | Content text, not long reading |
| Black text on #559E99 | 6.73:1 | AA | Lc 46.0 | Large or bold text, headings |
| #559E99 text on white | 3.11:1 | AA large text | Lc 58.0 | Large or bold text, headings |
| #559E99 text on black | 6.73:1 | AA | Lc -43.7 | 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
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CBDEDC
oklch(88.6% 0.02 189.2)
-
Step 300
300
#A7C9C5
oklch(81% 0.037 187.7)
-
Step 400
400
#76ADA8
oklch(70.8% 0.058 188.8)
-
Step 500
500 (this color)
#559E99
oklch(65.1% 0.074 189.7)
-
Step 600
600
#2E827D
oklch(55.5% 0.08 189.6)
-
Step 700
700
#1F6E6A
oklch(49.1% 0.074 190.1)
-
Step 800
800
#1D5A56
oklch(42.8% 0.062 189)
-
Step 900
900
#1F4A47
oklch(37.8% 0.048 189.2)
-
Step 950
950
#132B2A
oklch(26.9% 0.03 192)
#559E99 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) | #979799 | 0.079 |
| Deuteranopia (no green cones) | #8A8E9A | 0.073 |
| Tritanopia (no blue cones) | #31A19C | 0.025 |
| Achromatopsia (no color) | #929292 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559E99
#559E99
oklch(65.1% 0.074 189.7)
- #B77D85
#B77D85
oklch(65.1% 0.073 10.2)
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 #559E99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.015
- Dull Teal #5F9E8F ΔE 0.016
- Grey Teal #5E9B8A ΔE 0.021
- Sea #3C9992 ΔE 0.028
- Persian Green #2A9D8F ΔE 0.036
- Blue Green #0F9B8E ΔE 0.046
- Dusty Teal #4C9085 ΔE 0.046
- Teal Green #0A9396 ΔE 0.057
Use #559E99 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.