#66AABC
Closest named color: Greyblue (#77A1B5). oklch(70% 0.074 216.6), rgb(102, 170, 188).
Aa
Black text reads best on this color (8.04:1).
About this color
#66AABC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.074 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.027 away. Black text reads best on it, at 8.04:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.04:1 |
| White text | 2.61:1 |
Values
| HEX | #66AABC |
| RGB | rgb(102, 170, 188) |
| HSL | hsl(193, 39%, 57%) |
| OKLCH | oklch(70% 0.074 216.6) |
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 #66AABC | 2.61:1 | Fails | Lc -56.0 | Large or bold text, headings |
| Black text on #66AABC | 8.04:1 | AAA | Lc 53.2 | Large or bold text, headings |
| #66AABC text on white | 2.61:1 | Fails | Lc 50.9 | Large or bold text, headings |
| #66AABC text on black | 8.04:1 | AAA | Lc -51.1 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C7DEE4
oklch(88.5% 0.026 215.2)
-
Step 300
300
#A0C9D4
oklch(81% 0.046 215.9)
-
Step 400
400 (this color)
#66AABC
oklch(70% 0.074 216.6)
-
Step 500
500
#3797AE
oklch(63% 0.094 216.8)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#0E4957
oklch(37.6% 0.062 218)
-
Step 950
950
#0C2B33
oklch(27% 0.039 217.8)
#66AABC 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) | #9EA6BD | 0.066 |
| Deuteranopia (no green cones) | #909CBC | 0.059 |
| Tritanopia (no blue cones) | #3DB1AF | 0.045 |
| Achromatopsia (no color) | #A0A0A0 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AABC
#66AABC
oklch(70% 0.074 216.6)
- #C78E7E
#C78E7E
oklch(69.8% 0.074 36.3)
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 #66AABC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.027
- Bluegrey #85A3B2 ΔE 0.036
- Bluey Grey #89A0B0 ΔE 0.044
- Turquoise Blue #06B1C4 ΔE 0.047
- Cadet Blue #5F9EA0 ΔE 0.048
- Cool Steel #97A7B3 ΔE 0.055
- Cool Grey #95A3A6 ΔE 0.058
- Cool Gray #8D99AE ΔE 0.058
Use #66AABC 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.