#66A09E
Closest named color: Cadet Blue (#5F9EA0). oklch(66.5% 0.061 193), rgb(102, 160, 158).
Aa
Black text reads best on this color (7.08:1).
About this color
#66A09E is a medium-light, muted teal or cyan. In OKLCH its lightness is 67%, its chroma 0.061 and its hue 193°. 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 7.08:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 7.08:1 |
| White text | 2.96:1 |
Values
| HEX | #66A09E |
| RGB | rgb(102, 160, 158) |
| HSL | hsl(178, 23%, 51%) |
| OKLCH | oklch(66.5% 0.061 193) |
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 #66A09E | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #66A09E | 7.08:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #66A09E text on white | 2.96:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #66A09E text on black | 7.08:1 | AAA | Lc -45.7 | Large or bold text, headings |
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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CDDDDC
oklch(88.5% 0.017 192.3)
-
Step 300
300
#ACC7C6
oklch(80.9% 0.029 193.9)
-
Step 400
400
#7EAAA9
oklch(70.6% 0.047 194.4)
-
Step 500
500 (this color)
#66A09E
oklch(66.5% 0.061 193)
-
Step 600
600
#3F807E
oklch(55.7% 0.067 192.8)
-
Step 700
700
#316C6A
oklch(49.2% 0.061 192.4)
-
Step 800
800
#2A5857
oklch(42.8% 0.051 193.6)
-
Step 900
900
#274847
oklch(37.6% 0.039 193.1)
-
Step 950
950
#172A2A
oklch(26.9% 0.025 195.8)
#66A09E 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) | #999B9E | 0.063 |
| Deuteranopia (no green cones) | #8F939F | 0.060 |
| Tritanopia (no blue cones) | #4FA39F | 0.021 |
| Achromatopsia (no color) | #969696 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A09E
#66A09E
oklch(66.5% 0.061 193)
- #B68589
#B68589
oklch(66.6% 0.061 13.4)
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 #66A09E, 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 0.024
- Grey Teal #5E9B8A ΔE 0.032
- Greyblue #77A1B5 ΔE 0.041
- Sea #3C9992 ΔE 0.048
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.052
- Greeny Grey #7EA07A ΔE 0.055
Use #66A09E 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.