#66AAFF
Closest named color: Carolina Blue (#8AB8FE). oklch(73% 0.142 254.9), rgb(102, 170, 255).
Aa
Black text reads best on this color (8.75:1).
About this color
#66AAFF is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.142 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.057 away. Black text reads best on it, at 8.75:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.75:1 |
| White text | 2.39:1 |
Values
| HEX | #66AAFF |
| RGB | rgb(102, 170, 255) |
| HSL | hsl(213, 100%, 70%) |
| OKLCH | oklch(73% 0.142 254.9) |
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 #66AAFF | 2.39:1 | Fails | Lc -52.0 | Large or bold text, headings |
| Black text on #66AAFF | 8.75:1 | AAA | Lc 57.0 | Large or bold text, headings |
| #66AAFF text on white | 2.39:1 | Fails | Lc 47.0 | Large or bold text, headings |
| #66AAFF text on black | 8.75:1 | AAA | Lc -55.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBFA
oklch(88.4% 0.05 255.9)
-
Step 300
300
#9AC4FA
oklch(81% 0.089 255)
-
Step 400
400 (this color)
#66AAFF
oklch(73% 0.142 254.9)
-
Step 500
500
#2A89F4
oklch(63.2% 0.182 254.8)
-
Step 600
600
#0071DA
oklch(55.6% 0.182 254.8)
-
Step 700
700
#005FB9
oklch(49.2% 0.161 254.8)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#05407E
oklch(37.6% 0.119 255)
-
Step 950
950
#08264A
oklch(26.9% 0.075 255.4)
#66AAFF 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) | #86AFFF | 0.038 |
| Deuteranopia (no green cones) | #72A1FD | 0.024 |
| Tritanopia (no blue cones) | #00BDC9 | 0.118 |
| Achromatopsia (no color) | #A7A7A7 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAFF
#66AAFF
oklch(73% 0.142 254.9)
- #DB9928
#DB9928
oklch(73% 0.142 75.1)
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 #66AAFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.057
- Periwinkle Blue #8F99FB ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.067
- Perrywinkle #8F8CE7 ΔE 0.085
- Dark Sky Blue #448EE4 ΔE 0.089
- Soft Blue #6488EA ΔE 0.090
Use #66AAFF 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.