#66AA99
Closest named color: Dull Teal (#5F9E8F). oklch(68.8% 0.074 176.2), rgb(102, 170, 153).
Aa
Black text reads best on this color (7.77:1).
About this color
#66AA99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 69%, its chroma 0.074 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Teal (#5F9E8F), ΔE 0.036 away. Black text reads best on it, at 7.77:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dull Teal (#5F9E8F) |
| Black text | 7.77:1 |
| White text | 2.70:1 |
Values
| HEX | #66AA99 |
| RGB | rgb(102, 170, 153) |
| HSL | hsl(165, 29%, 53%) |
| OKLCH | oklch(68.8% 0.074 176.2) |
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 #66AA99 | 2.70:1 | Fails | Lc -57.5 | Large or bold text, headings |
| Black text on #66AA99 | 7.77:1 | AAA | Lc 51.7 | Large or bold text, headings |
| #66AA99 text on white | 2.70:1 | Fails | Lc 52.3 | Large or bold text, headings |
| #66AA99 text on black | 7.77:1 | AAA | Lc -49.6 | 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 400.
-
Step 50
50
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C8DFD8
oklch(88.5% 0.026 175.5)
-
Step 300
300
#A2CBBF
oklch(80.9% 0.047 175.3)
-
Step 400
400 (this color)
#66AA99
oklch(68.8% 0.074 176.2)
-
Step 500
500
#3D9C87
oklch(63% 0.095 176)
-
Step 600
600
#048771
oklch(55.7% 0.104 175.7)
-
Step 700
700
#00715F
oklch(49% 0.091 176.5)
-
Step 800
800
#015D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#124C40
oklch(37.6% 0.062 175.9)
-
Step 950
950
#0D2D26
oklch(27.1% 0.04 176.4)
#66AA99 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) | #A5A298 | 0.078 |
| Deuteranopia (no green cones) | #9A9A9A | 0.074 |
| Tritanopia (no blue cones) | #4FACA5 | 0.023 |
| Achromatopsia (no color) | #9D9D9D | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AA99
#66AA99
oklch(68.8% 0.074 176.2)
- #C1889C
#C1889C
oklch(68.9% 0.074 356.5)
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 #66AA99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Teal #5F9E8F ΔE 0.036
- Greeny Blue #42B395 ΔE 0.038
- Cadet Blue #5F9EA0 ΔE 0.041
- Tea #65AB7C ΔE 0.043
- Light Sea Green #20B2AA ΔE 0.045
- Grey Teal #5E9B8A ΔE 0.045
- Greeny Grey #7EA07A ΔE 0.046
- Grey Green #86A17D ΔE 0.047
Use #66AA99 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.