#66AFDB
Closest named color: Greyblue (#77A1B5). oklch(72.4% 0.097 236.7), rgb(102, 175, 219).
Aa
Black text reads best on this color (8.71:1).
About this color
#66AFDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.097 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.058 away. Black text reads best on it, at 8.71:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.71:1 |
| White text | 2.40:1 |
Values
| HEX | #66AFDB |
| RGB | rgb(102, 175, 219) |
| HSL | hsl(203, 62%, 63%) |
| OKLCH | oklch(72.4% 0.097 236.7) |
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 #66AFDB | 2.40:1 | Fails | Lc -52.3 | Large or bold text, headings |
| Black text on #66AFDB | 8.71:1 | AAA | Lc 56.7 | Large or bold text, headings |
| #66AFDB text on white | 2.40:1 | Fails | Lc 47.3 | Large or bold text, headings |
| #66AFDB text on black | 8.71:1 | AAA | Lc -54.7 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDED
oklch(88.5% 0.034 237)
-
Step 300
300
#9CC7E3
oklch(80.8% 0.06 237)
-
Step 400
400 (this color)
#66AFDB
oklch(72.4% 0.097 236.7)
-
Step 500
500
#2793CB
oklch(63% 0.125 237.2)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#024767
oklch(37.7% 0.081 237)
-
Step 950
950
#072A3C
oklch(27% 0.051 235.9)
#66AFDB 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) | #9BAEDD | 0.059 |
| Deuteranopia (no green cones) | #8BA2DA | 0.050 |
| Tritanopia (no blue cones) | #15BABE | 0.076 |
| Achromatopsia (no color) | #A7A7A7 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AFDB
#66AFDB
oklch(72.4% 0.097 236.7)
- #D49668
#D49668
oklch(72.3% 0.097 57.1)
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 #66AFDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.063
- Deep Sky Blue #00BFFF ΔE 0.065
- Carolina Blue #8AB8FE ΔE 0.068
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Bluey Grey #89A0B0 ΔE 0.069
- Cool Steel #97A7B3 ΔE 0.072
Use #66AFDB 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.