#66AED5
Closest named color: Greyblue (#77A1B5). oklch(71.9% 0.092 233.7), rgb(102, 174, 213).
Aa
Black text reads best on this color (8.58:1).
About this color
#66AED5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.092 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.051 away. Black text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.58:1 |
| White text | 2.44:1 |
Values
| HEX | #66AED5 |
| RGB | rgb(102, 174, 213) |
| HSL | hsl(201, 57%, 62%) |
| OKLCH | oklch(71.9% 0.092 233.7) |
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 #66AED5 | 2.44:1 | Fails | Lc -53.0 | Large or bold text, headings |
| Black text on #66AED5 | 8.58:1 | AAA | Lc 56.0 | Large or bold text, headings |
| #66AED5 text on white | 2.44:1 | Fails | Lc 48.0 | Large or bold text, headings |
| #66AED5 text on black | 8.58:1 | AAA | Lc -54.0 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C5DDEB
oklch(88.4% 0.032 233.3)
-
Step 300
300
#9DC8E0
oklch(81% 0.057 232.8)
-
Step 400
400 (this color)
#66AED5
oklch(71.9% 0.092 233.7)
-
Step 500
500
#2B94C5
oklch(63% 0.117 233.9)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#044864
oklch(37.8% 0.077 233.4)
-
Step 950
950
#082A3A
oklch(27% 0.048 233.3)
#66AED5 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) | #9BACD7 | 0.060 |
| Deuteranopia (no green cones) | #8CA0D4 | 0.053 |
| Tritanopia (no blue cones) | #21B8BB | 0.070 |
| Achromatopsia (no color) | #A6A6A6 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AED5
#66AED5
oklch(71.9% 0.092 233.7)
- #D2946C
#D2946C
oklch(71.8% 0.093 53.5)
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 #66AED5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.051
- Bluegrey #85A3B2 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.058
- Bluey Grey #89A0B0 ΔE 0.063
- Cool Steel #97A7B3 ΔE 0.067
- Deep Sky Blue #00BFFF ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.073
- Cool Gray #8D99AE ΔE 0.075
Use #66AED5 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.