#66BFCB
Closest named color: Medium Turquoise (#48D1CC). oklch(75.4% 0.087 206.9), rgb(102, 191, 203).
Aa
Black text reads best on this color (9.87:1).
About this color
#66BFCB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.087 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.052 away. Black text reads best on it, at 9.87:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 9.87:1 |
| White text | 2.12:1 |
Values
| HEX | #66BFCB |
| RGB | rgb(102, 191, 203) |
| HSL | hsl(187, 49%, 60%) |
| OKLCH | oklch(75.4% 0.087 206.9) |
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 #66BFCB | 2.12:1 | Fails | Lc -46.2 | Large or bold text, headings |
| Black text on #66BFCB | 9.87:1 | AAA | Lc 62.4 | Content text, not long reading |
| #66BFCB text on white | 2.12:1 | Fails | Lc 41.5 | Non-text elements, placeholder text |
| #66BFCB text on black | 9.87:1 | AAA | Lc -60.7 | Content text, not long reading |
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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDEF
oklch(93.6% 0.015 207.1)
-
Step 200
200
#C3DFE3
oklch(88.4% 0.03 207.1)
-
Step 300
300
#98CBD2
oklch(80.9% 0.054 206.7)
-
Step 400
400 (this color)
#66BFCB
oklch(75.4% 0.087 206.9)
-
Step 500
500
#009BAA
oklch(63% 0.108 206.9)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#66BFCB 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) | #B2B9CC | 0.085 |
| Deuteranopia (no green cones) | #A2ADCB | 0.077 |
| Tritanopia (no blue cones) | #27C6C2 | 0.044 |
| Achromatopsia (no color) | #B2B2B2 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BFCB
#66BFCB
oklch(75.4% 0.087 206.9)
- #E19A91
#E19A91
oklch(75.4% 0.087 27.3)
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 #66BFCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.052
- Vivid Sky Blue #4CC9F0 ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.058
- Light Grey Blue #9DBCD4 ΔE 0.061
- Pale Teal #82CBB2 ΔE 0.062
- Topaz #13BBAF ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.066
Use #66BFCB 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.