#66AAA4
Closest named color: Cadet Blue (#5F9EA0). oklch(69.1% 0.07 188.5), rgb(102, 170, 164).
Aa
Black text reads best on this color (7.85:1).
About this color
#66AAA4 is a medium-light, muted teal or cyan. In OKLCH its lightness is 69%, its chroma 0.070 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.036 away. Black text reads best on it, at 7.85:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 7.85:1 |
| White text | 2.67:1 |
Values
| HEX | #66AAA4 |
| RGB | rgb(102, 170, 164) |
| HSL | hsl(175, 29%, 53%) |
| OKLCH | oklch(69.1% 0.07 188.5) |
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 #66AAA4 | 2.67:1 | Fails | Lc -57.1 | Large or bold text, headings |
| Black text on #66AAA4 | 7.85:1 | AAA | Lc 52.1 | Large or bold text, headings |
| #66AAA4 text on white | 2.67:1 | Fails | Lc 51.9 | Large or bold text, headings |
| #66AAA4 text on black | 7.85:1 | AAA | Lc -50.0 | 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEB
oklch(93.7% 0.013 185.1)
-
Step 200
200
#C8DFDC
oklch(88.6% 0.025 187.3)
-
Step 300
300
#A1CAC6
oklch(80.8% 0.044 189)
-
Step 400
400 (this color)
#66AAA4
oklch(69.1% 0.07 188.5)
-
Step 500
500
#3B9B94
oklch(63.1% 0.09 188.4)
-
Step 600
600
#00857E
oklch(55.6% 0.097 188.3)
-
Step 700
700
#00706A
oklch(49.1% 0.085 188.3)
-
Step 800
800
#005C57
oklch(42.8% 0.074 188.4)
-
Step 900
900
#114B48
oklch(37.6% 0.058 189.9)
-
Step 950
950
#0D2C2A
oklch(26.9% 0.037 189.4)
#66AAA4 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) | #A3A3A4 | 0.074 |
| Deuteranopia (no green cones) | #979AA5 | 0.071 |
| Tritanopia (no blue cones) | #4BADA8 | 0.022 |
| Achromatopsia (no color) | #9E9E9E | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAA4
#66AAA4
oklch(69.1% 0.07 188.5)
- #C28A93
#C28A93
oklch(69.1% 0.069 8.4)
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 #66AAA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.036
- Dull Teal #5F9E8F ΔE 0.041
- Light Sea Green #20B2AA ΔE 0.044
- Greyblue #77A1B5 ΔE 0.046
- Bluegrey #85A3B2 ΔE 0.048
- Greeny Blue #42B395 ΔE 0.049
- Grey Teal #5E9B8A ΔE 0.051
- Bluey Grey #89A0B0 ΔE 0.054
Use #66AAA4 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.