#66AEDF
Closest named color: Greyblue (#77A1B5). oklch(72.3% 0.102 240), rgb(102, 174, 223).
Aa
Black text reads best on this color (8.68:1).
About this color
#66AEDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.102 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.062 away. Black text reads best on it, at 8.68:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.68:1 |
| White text | 2.41:1 |
Values
| HEX | #66AEDF |
| RGB | rgb(102, 174, 223) |
| HSL | hsl(204, 65%, 64%) |
| OKLCH | oklch(72.3% 0.102 240) |
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 #66AEDF | 2.41:1 | Fails | Lc -52.4 | Large or bold text, headings |
| Black text on #66AEDF | 8.68:1 | AAA | Lc 56.5 | Large or bold text, headings |
| #66AEDF text on white | 2.41:1 | Fails | Lc 47.5 | Large or bold text, headings |
| #66AEDF text on black | 8.68:1 | AAA | Lc -54.6 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C5DDEF
oklch(88.5% 0.036 240.3)
-
Step 300
300
#9CC7E6
oklch(81% 0.063 239.9)
-
Step 400
400 (this color)
#66AEDF
oklch(72.3% 0.102 240)
-
Step 500
500
#2992D0
oklch(63.1% 0.131 240.4)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557F
oklch(42.8% 0.098 239.8)
-
Step 900
900
#03466A
oklch(37.6% 0.085 240.6)
-
Step 950
950
#07293E
oklch(26.9% 0.055 240.7)
#66AEDF 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) | #98AEE1 | 0.056 |
| Deuteranopia (no green cones) | #88A1DE | 0.047 |
| Tritanopia (no blue cones) | #08BABE | 0.083 |
| Achromatopsia (no color) | #A7A7A7 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AEDF
#66AEDF
oklch(72.3% 0.102 240)
- #D59662
#D59662
oklch(72.4% 0.102 59.7)
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 #66AEDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.062
- Deep Sky Blue #00BFFF ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.065
- Bluegrey #85A3B2 ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.068
- Vivid Sky Blue #4CC9F0 ΔE 0.071
- Bluey Grey #89A0B0 ΔE 0.073
- Cornflower Blue #6495ED ΔE 0.077
Use #66AEDF 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.