#66AAAF
Closest named color: Greyblue (#77A1B5). oklch(69.5% 0.069 201.7), rgb(102, 170, 175).
Aa
Black text reads best on this color (7.93:1).
About this color
#66AAAF is a medium-light, muted teal or cyan. In OKLCH its lightness is 69%, its chroma 0.069 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.034 away. Black text reads best on it, at 7.93:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.93:1 |
| White text | 2.64:1 |
Values
| HEX | #66AAAF |
| RGB | rgb(102, 170, 175) |
| HSL | hsl(184, 31%, 54%) |
| OKLCH | oklch(69.5% 0.069 201.7) |
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 #66AAAF | 2.64:1 | Fails | Lc -56.6 | Large or bold text, headings |
| Black text on #66AAAF | 7.93:1 | AAA | Lc 52.6 | Large or bold text, headings |
| #66AAAF text on white | 2.64:1 | Fails | Lc 51.4 | Large or bold text, headings |
| #66AAAF text on black | 7.93:1 | AAA | Lc -50.5 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C8DEE0
oklch(88.5% 0.024 203.4)
-
Step 300
300
#A1C9CC
oklch(80.8% 0.043 202)
-
Step 400
400 (this color)
#66AAAF
oklch(69.5% 0.069 201.7)
-
Step 500
500
#3999A0
oklch(63% 0.089 202)
-
Step 600
600
#00838B
oklch(55.5% 0.095 202.3)
-
Step 700
700
#006E75
oklch(49% 0.083 202.5)
-
Step 800
800
#005A60
oklch(42.6% 0.073 202.7)
-
Step 900
900
#0F4B4F
oklch(37.8% 0.058 201.7)
-
Step 950
950
#0C2C2E
oklch(27.1% 0.037 201)
#66AAAF 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) | #A1A5AF | 0.070 |
| Deuteranopia (no green cones) | #949BAF | 0.065 |
| Tritanopia (no blue cones) | #45AFAB | 0.031 |
| Achromatopsia (no color) | #9F9F9F | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAAF
#66AAAF
oklch(69.5% 0.069 201.7)
- #C48C8A
#C48C8A
oklch(69.4% 0.069 21.3)
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 #66AAAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.034
- Cadet Blue #5F9EA0 ΔE 0.038
- Bluegrey #85A3B2 ΔE 0.039
- Bluey Grey #89A0B0 ΔE 0.046
- Light Sea Green #20B2AA ΔE 0.049
- Turquoise Blue #06B1C4 ΔE 0.051
- Dull Teal #5F9E8F ΔE 0.052
- Cool Grey #95A3A6 ΔE 0.054
Use #66AAAF 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.